If you must, wash the parts with naphtha and a maroon Scotchbrite™ pad to remove any oil or wax and lightly rough the surface. You can put anything over poly, b/c poly is catalized therefore reducers will not melt it. 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. 2008-12-17 02:10:12. Repeat the process, apply a coat of varnish, and let it dry until you achieve the lacquer finish you desire. While you can add a layer of polyurethane to laminate flooring, it's really not the best material to use. For example, polyurethane and lacquer look the same, both in a can and on the wood, even though they have very different characteristics. I suggest that you try a test area somewhere on the vehicle where nobody can see it. This product can actually be used on wooden floors. Also, do you want to keep the bench outside after this? Oil finishes tend to soak into the grain and yellow. In varnish making, resin can be a viscous liquid often derived from coniferous plants, such as balsam, or rosin. It isn't unusual to clear-coat an acrylic paint finish on a metal surface, such as on an automobile, with CAB-acrylic or acrylic lacquer. Be certain to work quickly adding a thin coat, but don't over-brush your work. Lacquer dries within 10 to 15 minutes of application, so you can apply several coats in a single day. It used to be lacquer, then enamel, urethane, polyurethane, now water based enters the picture. What are cons and pros of each and in what scenario you should choose one over the other? The original cabinets have lacquer on them....well dried and well adhered. 1968 Coronet R/T ACTS 16:31. Oil-Based Polyurethane Looks . Use a bristle brush, preferably of high-quality natural bristles, to apply the lacquer. You can choose from polyurethane, lacquer, shellac, or even varnish. Answered. Wiki User Answered . It will leave a sticky mess which won't every really dry. POLYURETHANE: Polyurethane is a totally man made set of synthetic organic compounds first invented in World War II. 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. 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. The lacquer will not bubble the poly. Spray lacquer is commonly used on new furniture and in new construction. Top. Top Answer. Also, can you coat polyurethane? Oil based poly offers more colour depth and shine. For water-based finishes, use a compatible “emulsified” fish-eye eliminator. Lacquer has a high VOC (volatile organic compound) content, which makes it dangerous to use without a respirator that has an organic vapor cartridge. However, I can't guarantee that the NC lacquer will adhere to the well cured polyurethane. I have a butcher block counter top on the kitchen island. Answer + 1. 7 8 9. Could I put polyurethane over old polyurethane? 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. Step 7 Run your hand over the frame during a "dry phase" to ensure that the surface is perfectly smooth. The thing about varnishing over wax is that wax is slippery old stuff and it takes an age to fully cure. Lacquer can discolor over a long time. Hi Mark, can you be more specific about what you want to put on top? On the bright side, polyurethane adheres well to most surfaces and can be applied over oil-based coats. I needed to just put a clear water-based polyurethane over the paint. 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. woodworking. OldDupontGuy. You can either use a vinyl sealer or dewaxed shellac as the barrier coat. Last time I used Rust-Oleum water-based matte polyurethane. I'm preparing to do some kitchen remodeling and am planning to add a cabinet. Professional wood finishers, who work on fine wood furniture, almost exclusively use lacquers. Its looking a little dull and I want to "re-poly" it but not re-stain it. One word of caution – read the label carefully and follow the specific instructions. Best of all, applying polyurethane doesn't require spray equipment and is a job you can easily do yourself. Most professionals agree that water-based varnish is the best product to use over paint. Lacquer. You can add additional coats later to even out the finish as needed. (Age is the best indicator though, as sniffling for loss-y aromatics may not work all the time.) Can you use polyurethane over a lacquer finish on wood? Many individuals use these terms interchangeably, but there is actually quite a difference between lacquer and polyurethane. Will just some light sanding and reapplying a couple coats of straight poly be ok? It is necessary that the surface be abraded--220 or 320 grit will work fine--so that the varnish has some … You got it backwards. 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 varnish is one of the best finishes for a countertop-- it's durable and, when applied properly, can be just as subtle as lacquer. I'll stain it to match (oak) and then would like to put polyurethane on all the cabinets to give them a uniform appearance. A dust mask will not protect you from the vapors of lacquer. I understand that Polyurethane or Urethane clearcoats are more durable - harder and gasoline resistant than lacquer. I proceed in the usual manner of sanding the wood to 320, then applying the General Finishes Seal a Cell as the first coat. 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. 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. If it really is tung oil, it won't work over lacquer or polyurethane. Poly, lacquer, waterbased poly…. Some of these water-based finishes are not for use over lacquer or shellac. Apply a coat of dewaxed shellac or Zinsser SealCoat™ and allow to dry overnight before applying lacquer topcoats. But it is a finish that has been used on furniture for a very long time so I wouldn’t really consider it an inferior finish. 5.8k. Beauty is in the eyes of the beholder they say. The rattlecan finish was easy and cheap, but I would like something tuff. 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. Varnish can be used to protect, preserve, and enhance paint. Understanding the differences between lacquer vs. polyurethane durability can help you to make a wise choice when it comes to finishing your latest project. Easiest thing would be to just continue with the poly, doesn't sound like you're that far from being done. Simply so, can lacquer be sprayed over polyurethane? Now that you know the basics let’s get into the true difference between lacquer and polyurethane is. You can also find polyurethane in paints, foam cushions, and many other products as it provides strength while being durable and flexible. There is a problem with putting lacquer over poly. With all the modern advances in coatings -- polyurethane, shellac, urethane, or varnish -- some confusion about formula is to be expected. Can you use polyurethane over lacquer on kitchen cabinets? Asked by Wiki User. Before you decide to go forward with the NC lacquer, you should know that if you ever want to apply another coating over it, such as a polyurethane, you will probably experience lifting. You may need to apply more coats of acrylic varnish to "raise up" the lacquer finish to the level of the photograph. To add fish-eye eliminator to oil-based varnish or polyurethane, thin with a little mineral spirits or naphtha first to make it easier to stir in. It's all subjective. You can never reconstitute polyurethane once it has hardened. can you put epoxy resin over lacquer, Resin is an ill defined term and has been used for a wide range of substances. It will be an adhesion problem. 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. View Entire Discussion (6 Comments) More posts from the DIY community . – Graphus Oct 8 '18 at 12:09 Dullness. It can also be a fossilized resin such as amber or copal or Kauri gum (fossilized Kauri tree gum found in New Zeland and similar to amber.) 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. Polyurethane is a more durable coating. 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. You can put anything you want over shellac. Lacquer vs. Polyurethane. The advantage of the water-based finish is ease of use, quick drying, no odor, and easy cleanup. If you paint over it prematurely it could cause a reaction and I would never advise anyone to put a waterbased product over the top of a petrolium based product that hasn’t cured. 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. See Answer. Polyurethane doesn't stick well to laminate floors, which are already covered in resin because of the way laminate is made. However, over time, oil poly tends to darken, thus becoming yellow. 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. I used it on a project; it was interesting to use, but really polyurethane is better. 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. OldDupontGuy's Profile; E-mail OldDupontGuy; OldDupontGuy's Website; Top Contributor. Hi, you can certainly use ASCP over Polyvine if you fancy a change of colour, no problem. Posted by 3 days ago. It is appropriate that you remove all the traces of grease on the oil-based finish using the procedures highlighted earlier on in this article. It was stained with a stain containing polyurethane. In contrast, woodworking is physics. It was fine, but I wasn’t impressed enough with it to use it again. 4 answers Hillela G. on Mar 2, 2017. Best of all, applying polyurethane doesn't require spray equipment and is a job you can easily do yourself. Some people like that and others don't. 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. You need to put a barrier coat in between the two. A brand of real tung oil is Hope's Tung Oil. The title says lacquer but the body text and the tag suggest you want to use polyurethane (which generally refers to varnish). 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