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