However, for specialty applications like marine or automotive, there are additional considerations. Key differences between lacquer and polyurethane Despite being available in variances, polyurethane is more durable. Bob thanks for the reply and URL. We never had a problem with any on them. In more severe cases the topcoat will delaminate off the lacquer primer. Can ram aluminum can crusher crush 10 cans in 10 seconds? Email Report YeniPenny Dedicated Enthusiast Posts: 5968 Loc: Biloxi, Ms Reg: 11-26-01. This will lay a first layer of velcro-like surface on which the paint will stick. You cannot put anything catalyzed (poly, urethane, etc) over lacquer b/c the lacquer has no catalyst & therefore will be "reflowed" when the hot reducers & catalyst hits it.....resulting in a list of potential problems. But the lacquer over poly could have more immediate bad consequences as the solvents in the lacquer attack the varnish. Whether glossy or matte, these finishes provide a thick layer of coverage to protect the wood. And if your lucky that's all. I know, I know, no one likes to sand! Thanks. Polyurethane will not bond or grip well with the lacquer and will peel off over time with general use. Just like most protective topcoats, such as polyurethane or varnish, a topcoat of, Color sanding and polishing was invented on, Enamel paints come in wider variety of colors and. I'm sorta new to this paint business, but I'm willing to try any suggestions ya'll might have. Cover up all parts of the car not being painted. Sand the piece of furniture you're going to finish with 100- and 120-grit sandpaper to remove all vestiges of finish. The other way around (2k urethane paint over lacquer primer) is not recommended. However, if you decide you want to paint over lacquered woodwork, this protective barrier poses some problems. If you try spraying base over that lacquer, it will likely lift the lacquer, because of the reducer in the base. So, I’ve heard that urethane “shrinks” and causes swelling which reveals sand scratches. Copyright 2020 FindAnyAnswer All rights reserved. A wet application can cause many paints and finishes to wrinkle or blister, even an old coat of lacquer itself. You should be able to spray lacquer over the 2k urethane primer. What cars have the most expensive catalytic converters? Pelican Parts Catalog for Porsche, BMW, Mercedes-Benz, MINI and More. For these reasons, lacquer is a good undercoat for any other paint product. Painting over an unprepared lacquered surface would be much of a waste of time because the paint will not find a … I used nason 2k etch primer, but I think I was supposed to use urethane or lacquer primer now that I'm looking at the product sheets. Spray the paint over the surface in the same even strokes as the primer. Likewise, can you paint over car lacquer? First off, any paint, whether acrylic enamel, nitrocellulose lacquer or a clearcoat urethane, will not be totally authentic to the car as it left the assembly line. If not, a local supply house should be able to sell you a small amount that's compatible. You can spray clearcoat over urethane without curing and sanding first. Urethane Primer does not require a Sealer for extended storage times. They are completely compatible. However, there is one thing that you need to have at the back of your mind before doing so. I'm sure they can tell you. Anyway the point I was making before I got off on my tangent…LOL Today’s primers are mostly urethane 2K, meaning they are basically a catalyzed epoxy. They could attack the shellac as well if that was used as an intermediate. Sanding. It is a protectant and sealer. Yes, it is okay to paint over your surface that has a lacquer finish. I want to paint them with the Eastwood underhood black (lacquer). The rattlecan finish was easy and cheap, but I would like something tuff. There are risks to spraying any type of solvent lacquer over any existing, and older, paint or finish. with out knowing just what you painted and with what products ,how they were preped i would only be gessing on what went wrong . Second, polyurethane is not the best choice for painting over lacquer finishes. Without the epoxy primer, it will chip with your fingernail. Second, polyurethane is not the best choice for painting over lacquer finishes. but the best way is to remove the lacquer primer . You certainly can with PPG products. Click to see full answer Accordingly, can you put urethane over lacquer? Lacquer surfaces don't accept paint as easily as raw wood surfaces. You certainly can with PPG products. Once you’re finished sanding the polyester primer, use a urethane primer or a sealer over it. Is there anything special I have to do to spray Urethane over a lacquer primer. The problem is the lacquer thinner in the lacquer. Lacquer finish helps seal wood for lasting durability. Alkyd varnishes are a polyester resin that will adhere better and repair more easily. Does Hermione die in Harry Potter and the cursed child? What's the difference between Koolaburra by UGG and UGG? Asked By: Kyla Asprilla | Last Updated: 23rd March, 2020. Wood furniture often comes with a polyurethane varnish or lacquer that prevents an easy or immediate decor change. I would order the same brand acrylic primer as your paint if they sell it. Instead, use an alkyd varnish. The two easiest ways to avoid problems are to spray … If you really want to paint over it, which I don't suggest, your best bet is to spray epoxy over it as a sealer. and try to use only products from one paint system . Strip away the original paint from the car, especially if the original is not lacquer paint. I'll send them a message. What is the difference between lacquer and urethane? "And nobody can … i was a BASF ( glasurit , RM , LIMCO ) paint tech rep. for years . Polyurethane will not bond or grip well with the lacquer and will peel off over time with general use. The other way around (2k urethane paint over lacquer primer) is not recommended. Urethane primers are a better surface for basecoats. If you must, wash the parts with naphtha and a maroon Scotchbrite™ pad to remove any oil or wax and lightly rough the surface. The urethane primer is much denser and seals the polyester surface. There are water-based polyurethanes not suitable for application over lacquer or shellac. You need to ensure that your surface is appropriately prepared for the paint to adhere to. You can rub a rag soaked with enamel reducer all day over top a lacquer finish and it won’t hurt it but take a rag full of lacquer thinner over an enamel painted surface and see what happens. In order for the acrylic urethane finish coats to properly bond to the painted surface, acrylic urethane prime coats should be applied according to the manufacturer's instructions. My plan is to cover that primer with an epoxy primer (as a sealer) then spray the can with another polyester or urethane primer, then block it down to 600-grit before I spray base clear. Always check the product sheet to know what works best for the poly primer you… The rule used to be - You can drop enamel over laquer but not laquer over enamel... not sure if that still hold true but I agree with rw, I would have sealed it off with epoxy to be safe.. Don't put polyurethane over lacquer primer, there will be inadequate bond. Pros/Cons of Applying Water Based Polyurethane Over Oil Based. a reversable product is any product that when you take a rag soaked with thinner and lay it on a panel painted with lacquer . It is also a finish coat that brings an immaculate shine and magnifies the beauty of everything from flooring to furniture. You need to seal the lacquer primer with an epoxy primer best if made by the same maker as the topcoat. Instead, use an alkyd varnish. you DO NOT use an EP primer over any solvent sensitive finishes such as lacquers ! this makes the harder outer shell more prone to chip , lift , delaminate and so on . Though urethane paint is very durable, the surface to which it is applied largely determines which primer to use. Take a vacation. If I were you I wouldn't even waste my time sanding. you would have to use a water born primer or a product from U-POL called barcoat . Apply acrylic urethane primer coat to all prepared surfaces. Give it another once over, when there are no flaws, epoxy prime, top coat. Polyurethane is a more durable coating. Painting Urethane over Lacquer primer. Polyurethane will not bond or grip well with the lacquer and will peel off over time with general use. It keeps moisture from damaging the wood. Second, polyurethane is not the best choice for painting over lacquer finishes. Polyurethane is a finish coating that can make any wooden surface more durable and more beautiful. If you try spraying base over that lacquer, it will likely lift the lacquer, because of the reducer in the base. What does it mean when your bf kisses you with his eyes open? Problem w/ polyurethane top coat over spray paint. Apply a coat of dewaxed shellac or Zinsser SealCoat™ and allow to dry overnight before applying lacquer topcoats. Go to a small corner of the wood, and take a small knife or coin and try to scrape up a little bit. Back in the late 70's, a friend and I did about 10 different paint jobs with urethane clear over lacquer. The problem back in those days was trying to get the final product to lacquer like finish; which we just … Lacquer paints dry to a hard shell, leaving a very thin paint film. You can even mix them together. I wouldn't trust going over Rustoelum. Spray atleast 2 LIGHT coats, unreduced. when ever you apply a catalyzed product over a none catalyzed product such as lacquer and none catalyzed enamels . 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. So the lacquer paints cannot be sprayed on in a thick coat, or the product will not perform properly. You should be able to spray lacquer over the 2k urethane primer. Urethane Primer contains more solids than lacquer primer and you will use about half the amount to do the same job. Start by cleaning the surface and filling in any cracks or imperfections. Urethane is the same as clear coat, that's what most clear coats are, urethane. except the base coat you should use all catalyzed products . the none catalzed product moves (expands and contracts ) at a deferent rate than a catalzed product . Apply a lacquer clear coat to the painted surface. Lacquer; Or, all surfaces with oil-based paint; How To Use Oil Bond. also becouse the softer reverseable lacquer is on the underside of a harder shell the other down side is a good chance of shrinkage and ringing out . It is thick and leaves a strong coating. it will reverse back to its state when it was applyed . Lacquer is thin and penetrates the wood surface. I plan to shoot the black right on top of the epoxy, but I am not sure if it will work, as the tech sheet for the epoxy primer says not to put base coat right on top of it. SO YES it can be doen . "Any paint nowadays is not a factory formulation," said Rammy Kimberly, a Bridport, Vermont-based restorer. How can you tell if lacquer or polyurethane? It is also durable but susceptible to scratches and discoloration after some time. I'm no bodyman, but what I learned is epoxy primer, filler, sand, high build primer/filler, wet sand, prime, sand, prime, sand, prime until you can't fucking stand it anymore. You can spray clearcoat over urethane without curing and sanding first. A polyurethane finish or varnish is a durable coating that protects a wooden surface, which means you can’t paint directly over it or your paint won’t adhere to it. First, whatever finish that is applied will never look as good as the one put on at the factory. Additionally, can you paint over car lacquer? But with the right materials, and a little bit of elbow grease, you can paint over the polyurethane. Instead, use an alkyd varnish. It’s one of my least favorite tasks in any DIY project. use their primer, paint and clear topcoat for a completely compatible system and make sure to follow the instructions. If you do not expect to paint the vehicle with top coat for an extended period of time then you should wait to sand the surface or spot prime any areas that you break through during sanding. I just finished the body work on my 46 Hudson Pickup truck. Polyurethane can be oil- or water-based, and you can use either kind over latex paint; however, oil-based polyurethane tends to yellow as it ages, whereas water-based varieties stay transparent. Can you put polyurethane over nitrocellulose? (Lacquer thinner often has ethanol as a dilutant.) I just finished the body work on my 46 Hudson Pickup truck. Can I leave Christmas lights on overnight in my room? … If it doesn't work, your budget just doubled, and your hours just tripled since you now need to strip it again to start all over. We recommend you use the MP-2K Urethane Primer. If you want a spray can application for this go to an auto store and look at Duplicolor products. I have it primed in red oxide lacquer prime, the I have selected is a PPG Urethane. Personally I would have used an epoxy primer. The car sat for about a year in that state. It has very easy to sand properties, high build and cures fast. 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. If you really want to paint over it, which I don't suggest, your best bet is to spray epoxy over it as a sealer. Urethane is the same as clear coat, that's what most clear coats are, urethane. Today with enamels, acrylics, urethane, base , clear, etc, etc, I have no clue. Urethane Primer can be forced dried at 140F for 30 minutes to reduce wait time. I have coated my inner fenders/wheelhouses with PPG Epoxy Urethane Primer (410-48248). One may also ask, can you clear coat urethane paint? Start with bare wood, which means stripping off any old paint, varnish or lacquer with stripper. Using an inappropriate primer can cause paint failure. Coat the surface of the car's body with primer. One may also ask, can you clear coat urethane paint? Lacquer can be over-coated with other lacquer, paints, or enamels and acrylics. There are no significant advantages or disadvantages of applying water-based polyurethane over oil-based. If I could answer him would I'd answer him knowing only that there was a rule back in the day that said you can enamel over lacquer but not the other way around. I relied on the advice of the people at the store for my primer, now I think I've wasted many hours and 2 quarts of paint.