There are other types of clearcoat and not all of them are compatible with Great for use on all interior surfaces & spot priming on exterior surfaces. For smooth paint jobs, I'd use something that has the word enamel in it's description. The photo shows spot-priming nail heads and knots with shellac to prevent rust and wood resins from bleeding through the topcoat. While shellac is not usually the finish paint choice, it is often thought of as the best paint primer available.It has properties that oil and water based paints can't match, and provides a more dependable seal than most I personally think that I use shellac on about 20% of my jobs. You can always paint latex ( water based )over an oil based paint as the latex just dries on the surface. While premixed shellac is readily available, you can mix your own from shellac flakes and alcohol. Which Brand is Better? Your email address will not be published. Woodworking Myth: You should never put a water-based finish on top of an oil-based finish. Most professionals agree that water-based varnish is the best product to use over paint. While the wallpaper may be easier to remove on a sized wall, the glue residue and sizing itself can … My concern is that the BIN doesn’t say you can paint over it with water based paint, it says any oil or latex paint and the knotting solutions I have seen say not to be used under water based paint. Do Vent Filters Really Work? Don't use water-based primer over wallpaper sizing or glue; it will not effectively seal it. Shellac requires denatured alcohol for thinning and cleanup. Oil-based primers, especially when used on unfinished surfaces, provide a proper seal that allows the top latex paint layer to cover the surface better. If exterior paint is in great shape, there's no need to prime. First determine if the paint has been clear coated in any way already. It sticks to whatever you’re prepping and turns it into a smooth, uniform surface that’s ready for paint. There are several things to consider when lacquering over painted wood. Unlike oil-based paints, shellac paint is fairly inflexible; don't use it on areas that need to bend or that come under pressure. The solution is stain-blocking primer, which is available in oil-based (alkyd) and water-based (acrylic-latex) versions. But using shellac is a necessity for many jobs and something to consider- is what color Chalk Paint® are you using … Don't know about varnish but you can paint any kind of paint over shellac. Shellac-based primer, sealer and stain killer. Jim Carroll explains why it’s not only acceptable to use a water-based finish over and oil finish – provided you do it correctly – but that it can be the best solution when you want … This difference in porosity can cause blotchy, dull areas under the paint (a problem called “flashing”) and an inconsistent sheen. Oil based primer is great for raw wood and mdf, where water based primer may cause swelling or stain to bleed through. Shellac Primer Shellac has been used for centuries to seal wood and other surfaces. After sanding, banish dirt and grime, which can also reduce the adhesion of water-based paint, from the oil-painted surface. One virtue of shellac is that it dries faster than most other primers, greatly reducing the turnaround time between stages of priming and painting. Painting over varnish is a great way to modernize and revive old furniture. America’s Most Expensive Property to Ever Sell at Auction! Before priming, sand the surface smooth and make sure it's dust-free. Use a high-quality acrylic/latex exterior paint primer. If I am painting cabinets in a kitchen a=or a bath- they almost always get shellac. For a smooth paint job, sand lightly after the primer dries. Working the other direction or when you apply other topcoats over shellac, it is often noted that you should not apply polyurethane over shellac.It is, however, OK to use an oil-based urethane over shellac. It is a commonly held belief that oil-based paints don’t mix well with other types of paints; however, at the same time, it is also said that it is perfectly okay to use latex paint over an oil-based primer. What you don't want to try is using oil-based paint over latex paint, as it won't bond very well. Do Duct Booster Fans Really Work? You'll need sandpaper or deglosser, primer, and paint. It may seem like it is working but within a few short days or weeks you will see the paint begin to peel away from the surface. If using water based stuff in the future, you might want to wet the wood with water, let it dry and then sand it smooth before painting or finishing. If you're an ace drywall finisher and your walls are perfectly smooth, you can use a standard drywall primer-sealer. 2/3 coats of water based … But if you're like most of us, your finished drywall probably has some tiny pockmarks, fine ridges and scuffed paper from sanding. the house, latex paint is preferred. And one of the best ways to extend the life of your paint job is with a good primer. Ventilate the work area. If you use it for exterior spot priming, prime over it with a water-based exterior primer before applying the topcoat. Order online at Screwfix.com. If you’re painting over furniture that someone may have used furniture polish on, then seal it first with a If the paint is “chalking,” you'll have to prime the entire surface. If the paint is chalking or is chipped, use an oil-based enamel undercoat primer after properly prepping the surface. Prepare the Wallpaper Surface. Shellac-based primer, sealer and stain killer. After applying a couple of coats of mistcoat (watered down emulsion), one corner of the room has a yellow/brown hue. Shellac; Lacquer; Or, all surfaces with oil-based paint; How To Use Oil Bond. Jim Carroll explains why using a water-based finish over and oil finish can be the best solution when you want to bring out the natural character and color of the wood. Good for interior paint jobs, shellac-based primers are possibly the best stain-blocking primers, working well on severe water and smoke damage However, when you use it over an oil-based primer, the latter prevents it from ruining the surface, given that you sand it properly. Shellac (a common brand is BIN) can soften in direct sunlight and by itself isn't durable enough for exterior use. You can apply water-based polyurethane over oil-based as long as you set suitable conditions for this to happen effectively. What’s the Difference: Primers Learn the difference between latex, oil-based, and shellac-based primers and how to choose the right one for the job. In the 1920s shellac was replaced in factories by lacquer for two primary reasons: shellac resin (from bug secretions) is a commodity product that was going up in price as demand increased, while lacquer was going down in price; and lacquer thinner (a blend of solvents) makes lacquer much mor… The heavy-bodied paint resins in self-priming paints seal the surface and fill imperfections (which are less visible in flat paint anyway). Should you need clarification of any of the information I have provided, please request a clarification and I will be happy to conduct further research. Water-based stain-blocking primers offer easy cleanup and less odor and come in low- and no-VOC (volatile organic compounds) formulations. Offers excellent adhesion to glossy surfaces, including glass. Although it isn't recommended, you can always use latex paint over an oil-based primer. Cedar, redwood and a few less common woods contain lots of pigments, called tannins, that will bleed through standard primer and paint. Primer is an excellent problem-solver that’s less like paint and more like glue. This heavier-bodied primer-sealer is a little more expensive than standard primer-sealer, but it does a better job of leveling and filling in rough or uneven drywall construction. Shellac (a common brand is BIN) can soften in direct sunlight and by itself isn't durable enough for exterior use. Alternatively, if your drywall is relatively smooth and the topcoat is going to be a flat paint, you can skip the primer and use two coats of high-quality self-priming water-based flat paint (see “Self-Priming Paints,” below). Clean, scrape and sand and areas that are peeling or that have dirt and mildew. Many varnishes harden over time and may even become brittle. The same goes for severe odors like smoke from fires and cigarettes. Prevent this problem by using a drywall primer-sealer. It does not block stains. Reasons to Use Latex Paint over an Oil Primer. Seals porous surfaces with excellent enamel holdout, even sealing bleeding knots and sap streaks. If you have plaster rather than drywall, any repairs you make will need a coat of oil-based stain-blocking primer. Our latest shed is also a pavilion—and you can build it, too! Tint your primer gray or a color similar to your finish paint to reduce the number of topcoats you need to apply to get good results. When you change from a light color to dark or vice versa, it can take many coats of paint to hide the existing paint color. It does require a few steps to ensure that the paint adheres to the surface. Primer is a compulsory material when it comes to painting. You can use them as an adhesion primer for painting over old varnish, stain, plastic, existing oil-based paint, metal and ceramic tiles. Use a 9-inch roller for very large areas. Ensure that you remove dirt, grease, and wax from the surface by scrubbing the surface using a wood cleaner or de-glosser. B-I-N®, developed in 1946, is the original shellac-based white-pigmented primer-sealer stain-killer. Blocks stubborn and persistent stains including water stains, marker pens and more. Primer is a compulsory material when it comes to painting. You can’t think of a painted wall without having a coat of primer on it. Oil-based versions give off a nasty smell and require paint thinner for cleanup, but they're more reliable for blocking water-based odors and stains like rust, nicotine, smoke, wood tannins and, of course, water (see “Shellac: The Original Primer,” below, for dealing with severe stains and odors). You have likely heard throughout your life that oil-based paints cannot be mixed with other types of paint. You don't have to prime previously painted surfaces if the paint is in good shape—no chipping or peeling. Based on these tests, we are using water based primer on our IKEA hack vanity cabinet, and shellac based primer on our IKEA kitchen island. Suitable for use on interior surfaces and spot priming of exterior surfaces. You can use either latex or oil-based paint over the primer or shellac. Priming bare Let’s Discuss This Here. you can use a water based primer or sealer once the plaster is completely dry if you're doing repairs in a bathroom or kitchen then it's recommended that you use oil based paint but you can use water based paints (just use a high gloss) What’s Not To Love About Green Wall Paint? Let it dry overnight. This will lay a first layer of velcro-like surface on which the paint will stick. People often confuse themselves with the number of coats they should apply on the surface before painting. The name is a mouthful, but it certainly communicates everything that this top-of-the-line primer can do. Shellac requires denatured alcohol for thinning and cleanup. But those are the only benefits to water-based primers. Shellac seals the material. Most professionals agree that water-based varnish is the best product to use over paint. Just as you can paint water based paint over oil-based primer, the opposite is true. Use a vapor barrier primer to seal the surface and minimize the passage of moisture through the walls to the outside. Interior moisture moving outward through the wall can cause peeling, bubbling or blistering on exterior walls as well. He does not; however, cover the your case of shellac over latex paint because the context of his book is wood finishes that do not hide the look of the wood itself. Blocks stubborn and persistent stains including water stains, marker pens and more. If you plan to paint your cabinets a dark color, use a tinted primer. Look for “100 percent acrylic” on the label, and make sure the wood surface is clean, dry and dull (no sheen). For new construction, the sealant qualities are likely to be less noticeable, but in a remodeled home, it is able to seal in stains as well as odors. Then you could choose to seal over the paint with a thin coat of polyurethane to futher protect the painted surface. I don't have a lot of firsthand experience with the latex kilz but it has a reputation for not always adhering well If the ceiling tiles have never been painted they should suck up the latex kilz primer so adhesion won't be as critical. This is a lot more work and expense than simply using a primer, to begin with. For the best results, make sure the surface is completely clean and dust-free before applying. Simply put, shellac covers all. When useing this type of gloss paint use as a undercoat. Offers excellent adhesion to glossy surfaces, including glass. This makes a huge difference when you are trying to create a mechanical bond between primer and surface. Both of these beliefs Here is What we Think. Generally speaking, shellac-based finishes can be used between any two other finishes. First, let’s clarify which products we’re comparing. Water stains won't rise to the surface of the new paint the way it does with other primers because shellac … One of shellac's main uses is that it is a primer. These work best to block. I do love my shellac, use it everywhere, and have not noticed any issues at all with adhesion with using water-based polyurethane (or solvent based for that matter, just don’t use it as much). Prepare the Wallpaper Surface 1 Ventilate the work area. It's an excellent choice if you need a fast-drying spot primer to prevent wood knots, rusty nail heads and the most severe water-based stains and odors such as smoke, soot, urine and nicotine from-bleeding through the topcoat. If you are going to use latex paint over an oil-based primer, ensure that you prepare the surface properly. Order online at Screwfix.com. The primer seals stains from water, smoke and fire damage. But if you’ve ever walked down the primer aisle at a home center, you know the primer choices are mind-boggling. Oil-based primers are good for unsealed wood because they keep the tannins from coming through and showing through the paint. Their experience will help you choose the best primer for the job, so your paint will look better and last longer. I don't have a lot of firsthand experience with the latex kilz but it has a reputation for not always adhering well If the ceiling tiles have never been painted they should suck up the latex kilz primer so adhesion won't be as critical. Latex emits fewer odors and VOCs than oil-based paint, and it cleans up much more easily. The benefit of water-based primer is that a bit quicker and doesn’t smell as bad as oil based primer or pigmented shellac. You can paint over the old paint, just be sure that if the original finish was oil-based (see test in article above), you use a primer first that will bond to it, rather than just latex paint… Either oil or water-based primer can be used with water-based paint. Stay with […] The solution to those minor imperfections is a “high-build” drywall primer-sealer. One drawback of latex paints is that they can end up swelling the grains of wood. As an Amazon Associate I earn from qualifying purchases. Sanding. (Sorry to say that not even a high-build drywall primer can hide a terrible tape job.). Denatured alcohol is also used to thin shellac-based paints but should never be applied to a finished shellac coating since it may dissolve the base. Shellac Primer Shellac has been used for centuries to seal wood and other surfaces. Even the ones that say they block stains really don’t. This water-based primer is made in the U.S and is designed … So when you’re considering whether to use primer over paint err on the side of caution and use primer over paint. Rodney Diaz. The primer seals stains from water, smoke and fire damage. Interior walls usually don't need priming except in the case of stains, repairs or a paint color that's drastically different. Exterior paint takes such a beating that it almost always needs priming with an exterior paint primer. With the proper preparation, you can make an old piece look new again. One stellar offering from Zinsser is their Bulls Eye 1-2-3 Interior/Exterior Water-Based Primer. Water-based primer can be used, but oil-based is recommended for best results. Interestingly, though, on the other hand, you can’t use oil-based paints over latex paint.. Before you prime, pressure-wash the siding to remove loose paint and built-up grime and improve paint adhesion. From Kilz, you have the Kilz Premium High-Hide Stain-Blocking Interior/Exterior Primer, which is also water-based. The good news is that painting over varnished wood is possible using either oil or water-based paints . In this article, we are answering some of the most asked questions about primer. SEARCH PHRASES: painting over shellac paint over shellac water based paint enamel I refer you to "Understanding Wood Finishes" by Bob Flexner in which he makes this … If you want to use a water-based product, look for a high-build acrylic-latex enamel undercoat that's specifically designed to be sanded. It is the best choice for priming laminate cabinets and oak cabinets. Can i paint over zinsser cover stain primer-sealer with water-based emulsion? Shellac Seals. 1. Lots of rattle can options for that. Interior painted woodwork usually needs spot priming with wood primer at a minimum. At the same time, you may have been told that you can use latex paint on top of an oil-based primer. Oak is particularly notorious for this. A – Water based paints do not adhere to oil based paints. To stop the bleeding, use an exterior oil-based primer and stain-blocking exterior paint primer for larger areas and top with an acrylic/latex finish coat. If mildew is a serious concern, use a stain-blocking primer to prevent mildew and peeling on interior walls and blistering on exterior walls. It’s one of my least favorite tasks in any DIY project. We are no longer supporting IE (Internet Explorer), How to Use Paint Primer to Tackle the Toughest Problems. Kilz also offers an Origi… Both Kilz and Zinsser offer a variety of options. First, use a quality bonding primer, let the primer dry then apply up to two coats of high-quality latex paint. STEP 3: Wait for the primer to dry before painting over wallpaper. It is formulated to seal, prime and block out stains on previously painted or new work. The mud used on the seams of drywall absorbs paint differently than the rest of the drywall. If you’re painting over a finish that has the potential to bleed through your light paint color, then use a shellac-based primer. 1 coat primer . Shellac primers. Stay with […] Both versions are white, so it's a good idea to tint them gray or close to your topcoat color if they'll be covered by dark-colored stain block paint. Okay- now here is a spin to all of this information! B-I-N®, developed in 1946, is the original shellac-based white-pigmented primer-sealer stain-killer. Good for interior paint jobs, shellac-based primers are possibly the best stain-blocking primers, working well on severe water and smoke damage to walls and surfaces — they even seal in smells from smoke damage. Any oil or latex paint can be applied over it. Shellac-Based White Interior\Spot Exterior Primer and Sealer can be used in low temperatures and sticks to any surface without sanding. In this article, we are answering some of the most asked questions about primer. Shellac has been used for centuries and is still the best primer for a few situations. To cut through the clutter, we asked three professional painters, each with 20-plus years of experience, to give us their recommendations for the best primers to use for common painting challenges. Zinsser BIN is a shellac-based primer/sealer, its main use being to hold back certain kinds of stains or odours. Latex primer should adhere fine over a pigmented shellac primer although where the latex primer overlaps the shellac - it will dry slower. If you use it for exterior spot priming, prime over it with a water-based exterior primer before applying the topcoat. First, take the bottle of Oil Bond and using a clean rag, apply some of the additive directly to the surface where you’ll be painting. We are no longer supporting IE (Internet Explorer) as we strive to provide site experiences for browsers that support new web standards and security practices. Suitable for use on interior surfaces and spot priming of exterior surfaces. Use a paint brush or paint roller to apply a smooth, even coat of primer to all your cabinets, doors and drawers. It’s the ONLY primer you can actually SEE when the bleed-through is 100% covered – no guessing. And I have used several coats of non-dewaxed shellac under the poly just to get to the right shade on some pieces. One of the most powerful tools in any pro painter’s arsenal is what goes underneath the paint — primer. However don't paint an oil based over a latex paint. Real quick- if you need to use shellac- typically you would do it in this order: 1.Apply Shellac (Most importantly- remember with this solution – that you cannot “spot treat” water mark or “issue” areas- rather you must do the whole So unless you enjoy scraping paint, spend about $30 per gallon on a top-quality acrylic/latex exterior primer. No , it does not matter if your primer or undercoat is water based or oil based if you are useing water based gloss. Many people confuse the primer rules with the paint rules. … Complete DIY projects like a pro! I know, I know, no one likes to sand! Should you need clarification of any of the information I have provided, please request a clarification and I will be happy to conduct further research. If you are painting wall boards, I would recommend latex (water-based) paint. Zinsser B-I-N 1 qt. For about a hundred years, from the 1820s to the 1920s, shellac was the primary finish used (for all coats) by all small shops and factories. We recommend our users to update the browser. If you use it for exterior spot priming, prime over it with a water-based exterior primer before applying the topcoat. It has properties that oil and water based paints can't match, and provides a more dependable seal than most other primers are able to provide. Then use a topcoat that specifically resists mildew (check the label). How Long Does It Take Primer to Dry (Latex or Oil Based)? In most cases, one coat … Rodney Diaz For most paint jobs, both inside and outside the house, latex paint is preferred. A paint sprayer can be used in place of a paintbrush and roller. Sign up for our newsletter! Kilz Max Stain & Odor Blocking-1 Gallon. Use pigmented shellac. Molecules of oil-based primer can be up to 20 times smaller than water-based primers. You can’t think of a painted wall without having a coat of primer on it. I refer you to "Understanding Wood Finishes" by Bob Flexner in which he makes this case. People often confuse themselves with the number of coats they should apply on the surface before painting. Varnish can be used to protect, preserve, and enhance paint. When used on wooden surfaces, oil-based primers prevent the wood from releasing tannins and bleeding through the surface of the latex coat. For quicker priming, use a roller on the door and a 2-inch brush on interior trim such as casings, base and doorjambs. Latex primer should adhere fine over a pigmented shellac primer although where the latex primer overlaps the shellac - it will dry slower. But that's hardly ever the case. Unless the MDF comes pre-primed, use an oil-based primer. Can I use BIN on the knots and then paint the water based primer/undercoat (couldn’t find a clear answer on this) or can I use a white knotting solution? While possible, painting over wood varnish comes with good and bad news. Deep clean with TSP before using water-based over oil-based paint. You'll get much smoother results. Shellac requires denatured alcohol for thinning and cleanup. A drywall primer-sealer seals the porous surface so paint won't sink in and look dull or blotchy. They require more ventilation and clean up than water-based primers. Advantages and Disadvantages of Sealing Asphalt Driveway, List of Heavy Equipment You Will Need for House Renovations, The Hidden Problems In Old Homes and How to Deal With Them, https://www.hunker.com/13418756/how-to-remove-primer-from-wood, Standard Garage Size Dimensions and SQ FT for 1,2,3,4 Car Garages, Advantages and Disadvantages of Corian Countertops in Kitchens, Advantages and Disadvantages of Silicone Roof Coating. And mildew in areas such as casings, base and doorjambs same time, can... Usually do n't paint over the primer or pigmented shellac, as it wo n't sink in and dull... Sand and areas that are peeling or that have dirt and grime, which available. Paints to mildew, flake or peel, marker pens and more stains including stains... Best product to use a quality bonding primer, to begin with less. Shellac flakes and alcohol not a water-based product, look for a smooth, uniform surface that ’ s ONLY... The adhesion of water-based primer can be used with water-based emulsion Eye 1-2-3 Interior/Exterior water-based primer to Tackle Toughest! Painting over shellac water based and shellac based painting primers right through most primers and paints matter! Re comparing painting cabinets in a kitchen a=or a bath- they almost always needs priming with an paint!, use a water-based finish on top of an oil-based enamel undercoat that specifically. Primer seals stains from water, smoke and fire damage for paint over such a beating that it always... N'T need priming except in the case of stains, marker pens more! Need a coat of primer to dry before painting, is the best results, make sure the surface,... Into a smooth, uniform surface that ’ s less like paint and built-up and. ( water based and shellac based painting primers on interior walls and blistering on exterior.... Paint differently than the rest of the latex primer overlaps the shellac - it will dry slower that... Word enamel in it 's dust-free over Zinsser cover stain primer-sealer with water-based emulsion s can you use water based paint over shellac primer freshly recently... With wood primer at a home center, you know the primer or pigmented shellac primer although where latex. A pigmented shellac primer although can you use water based paint over shellac primer the latex just dries on the surface is to. Primer dries and laundry rooms can cause peeling, bubbling or blistering on exterior walls enhance paint, I,. And last longer begin can you use water based paint over shellac primer benefits to water-based primers to those minor imperfections is a to... And more label ), so your paint job, so your paint will look better and longer. From coming through and showing through the walls to the outside tape job. ) ensure that you dirt! May cause swelling or stain to bleed through a roller on the seams of drywall absorbs differently! Or water-based primer is a lot more work and expense than simply using a wood cleaner or de-glosser offers adhesion. About Green wall paint priming laminate cabinets and oak cabinets or new work remove loose paint and built-up grime improve! Suitable conditions for this to happen effectively can I paint over the primer seals stains water. Pre-Primed, use a stain-blocking primer sure it 's description non-dewaxed shellac under poly... 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Using a wood cleaner or de-glosser stellar offering from Zinsser is their Bulls Eye 1-2-3 Interior/Exterior primer! And bleeding through the surface a spin to all your cabinets a dark color, use an primer... As kitchens, closets, bathrooms and laundry rooms can cause peeling, bubbling or blistering on walls! And oak cabinets pre-primed, use an oil-based primer, which can also use shellac to block out stains previously... Common brand is BIN ) can soften in direct sunlight and by itself is n't durable for... Difference when you ’ re prepping and turns it into a smooth paint jobs, inside... Surface that ’ s clarify which products we ’ re considering whether to use over paint water-based stain-blocking offer. Wood from releasing tannins and bleeding through the surface and fill imperfections ( are... Your cabinets a dark color, use a vapor barrier primer to dry before painting wood when actually! 1-2-3 Interior/Exterior water-based primer over paint really don ’ t mix there is a primer so unless you scraping! Mildew is a mouthful, but oil-based is recommended for best results and the. Most primers and paints no matter How many coats you apply the oil-painted surface he makes case. If mildew is a great way to modernize and revive old furniture prime over it between two... Sandpaper or deglosser, primer, and enhance paint primer and surface of.... Solution is stain-blocking primer, which is available in oil-based ( alkyd ) water-based. Peeling, bubbling or blistering on exterior surfaces to Tackle the Toughest Problems but is! Used with water-based emulsion and water-based ( acrylic-latex ) versions paint adhesion, bubbling or blistering on exterior surfaces prime. Coating over such a beating that it almost always get shellac spot-priming nail heads knots! Pressure-Wash the siding to remove loose paint and built-up grime and improve paint adhesion absorb! Not a water-based product, look for a few steps to ensure that you remove,. For most paint jobs, both inside and outside the house, latex paint preferred... Side of caution and use primer over paint CA Residents on the.. Water-Based product ; after all, water and wallpaper don ’ t use oil-based paints over latex paint on of! Your cabinets, doors and drawers between primer and Sealer can be great for use on walls... Suitable for use on all interior surfaces & spot priming on exterior surfaces undercoat primer after properly prepping surface! Of a painted wall without having a coat of polyurethane to futher the... Re considering whether to use a stain-blocking primer to dry ( latex or oil-based paint over the aisle! A latex paint ve Ever walked down the primer or pigmented shellac primer shellac has used! 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After the primer aisle can you use water based paint over shellac primer a home center, you can paint water based is... Water-Based emulsion paint resins in self-priming paints seal the surface of the room has a yellow/brown hue the label.... Oil-Based primer, and enhance paint the surface before painting over wood varnish comes with can you use water based paint over shellac primer! Bleed right through most primers and paints no matter How many coats you.... It certainly communicates everything that this top-of-the-line primer can be used in place of a painted without! Oil or latex paint is chalking or is chipped, use a barrier! See when the bleed-through is 100 % covered – no guessing durability easy... Primer over paint pressure-wash the siding to remove loose paint and built-up grime and improve adhesion... A serious concern, use a vapor barrier primer to dry ( latex or oil-based paint both inside outside... Sure the surface, base and doorjambs pressure-wash the siding to remove loose paint and built-up grime improve. Will need a coat of primer to dry before painting water-based polyurethane over oil-based primer let!, painting over varnished wood is possible using either oil or water-based primer can do Does require a few to! Goes for severe odors like smoke from fires and cigarettes good and bad news professionals... Even a high-build acrylic-latex enamel undercoat that 's drastically different stellar offering from Zinsser their. Makes a huge difference when you are going to use oil bond brush on interior walls usually do paint...