Some believe that a good quality shellac finish is just as good as any other finish out there, but those guys also happen to sell shellac so it’s hard to say. Answer + 1. Repeat the process, apply a coat of varnish, and let it dry until you achieve the lacquer finish you desire. As Tonar mentioned you can shoot poly OVER lacquer; but spraying lacquer on top of poly will tend to leave a melted, bubbly gooey mess. Will just some light sanding and reapplying a couple coats of straight poly be ok? Best of all, applying polyurethane doesn't require spray equipment and is a job you can easily do yourself. Now that you know the basics let’s get into the true difference between lacquer and polyurethane is. There is a problem with putting lacquer over poly. While some polyurethane varnishes are very picky about to what substrates they will adhere, if you should want the kind of additional durability that you are aiming for you can use a traditional resin varnish over shellac (dewaxed or with the natural wax still included) or lacquer. If you must, wash the parts with naphtha and a maroon Scotchbrite™ pad to remove any oil or wax and lightly rough the surface. Water-based oil-modified polyurethane is a relatively new product that combines the durability of an oil base with the cleanup of a water base. I'll stain it to match (oak) and then would like to put polyurethane on all the cabinets to give them a uniform appearance. You can't sand down laminate in order to get the polyurethane to stick, so there's no way to improve the cohesion between the two. POLYURETHANE: Polyurethane is a totally man made set of synthetic organic compounds first invented in World War II. You can add additional coats later to even out the finish as needed. 2008-12-17 02:10:12. You may need to apply more coats of acrylic varnish to "raise up" the lacquer finish to the level of the photograph. Is it possible to spray a 2 part clearcoat (Poly/Urethane) over the acrylic lacquer, perhaps using some intermediate layer between them so there's no reaction. Many individuals use these terms interchangeably, but there is actually quite a difference between lacquer and polyurethane. Polyurethane is a more durable coating. Created from synthetic compounds and first used during World War II, polyurethane is a polymer that is strong, durable, and arguably the most popular of all topcoat finishes currently in use today. Re: Stupid mistake - polyurethane and lacquer Poly over lacquer is ok, lacquer over poly won't work because the thinners are to hot and they will melt the poly. I proceed in the usual manner of sanding the wood to 320, then applying the General Finishes Seal a Cell as the first coat. Some of these water-based finishes are not for use over lacquer or shellac. Posted by 3 days ago. The lacquer will not bubble the poly. Lacquer has a high VOC (volatile organic compound) content, which makes it dangerous to use without a respirator that has an organic vapor cartridge. Brush-on lacquer will dry quickly but is formulated to give you at least a little bit of time to apply and even out the finish. Dullness. I understand that Polyurethane or Urethane clearcoats are more durable - harder and gasoline resistant than lacquer. Professional wood finishers, who work on fine wood furniture, almost exclusively use lacquers. When you spray lacquer over a solvent-based acrylic finish, they combine to form a hybrid film, even if the acrylic is pigmented to form a paint. Lacquer can discolor over a long time. This product can actually be used on wooden floors. OldDupontGuy. woodworking. I used it on a project; it was interesting to use, but really polyurethane is better. You can see that a band saw is a band saw and not a table saw (even though both have a table) and that a mortise-and-tenon is not a dovetail. The title says lacquer but the body text and the tag suggest you want to use polyurethane (which generally refers to varnish). What are cons and pros of each and in what scenario you should choose one over the other? I needed to just put a clear water-based polyurethane over the paint. Out on a limb here - polyurethane over nitrocellulose paint is usually safe if the nitroucelluose paint is old and isn't gassing off any more. Can you use polyurethane over lacquer on kitchen cabinets? Use a bristle brush, preferably of high-quality natural bristles, to apply the lacquer. Oil finishes tend to soak into the grain and yellow. Simply so, can lacquer be sprayed over polyurethane? A brand of real tung oil is Hope's Tung Oil. 4 answers Hillela G. on Mar 2, 2017. The thing about varnishing over wax is that wax is slippery old stuff and it takes an age to fully cure. OldDupontGuy's Profile; E-mail OldDupontGuy; OldDupontGuy's Website; Top Contributor. You can either use a vinyl sealer or dewaxed shellac as the barrier coat. In contrast, woodworking is physics. We’ve answered the question can you apply water-based polyurethane over oil-based and we know that it’s okay to apply water-based poly can over oil-based provided that the surface of the application is in excellent condition bearing no dirt or grease. It is necessary that the surface be abraded--220 or 320 grit will work fine--so that the varnish has some … Most professionals agree that water-based varnish is the best product to use over paint. For water-based finishes, use a compatible “emulsified” fish-eye eliminator. It dries way to fast, does not self-level, and has ruined more than one project of mine, so that wasn’t even an option. Wiki User Answered . Answered. However, over time, oil poly tends to darken, thus becoming yellow. Lacquer vs. Polyurethane. It also can go over oil-based finishes and can be applied using synthetic-bristle brushes, a foam roller or a rag, as can other water-based polyurethanes. Hi, you can certainly use ASCP over Polyvine if you fancy a change of colour, no problem. Polyurethane varnish is one of the best finishes for a countertop-- it's durable and, when applied properly, can be just as subtle as lacquer. Also, can you coat polyurethane? Can you use polyurethane over a lacquer finish on wood? All have their pros and cons but when it comes to clear coat for automotive finishes polyurethane is state of the art for today at least. A dust mask will not protect you from the vapors of lacquer. Could I put polyurethane over old polyurethane? 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