Coating over an old finish has the great advantages of avoiding the always-messy stripping process and greatly reducing the amount of work involved. They are melamine in a … First they dull, then they begin to crack. I do like the look of black or dark wax over some painted pieces, and for that I will use it and then put Polyvine over it — only varnish to date I have found that you can do this with. Many thanks . solvent • But applying a finish over an existing finish is one of the riskiest operations you can do in finishing because it can result in any number of problems. In fact, any paint or finish that contains lacquer thinner or is thinned with lacquer thinner or with any of the active solvents in lacquer thinner (for example, acetone) has the possibility of attacking an existing coating and causing a problem. These include blistering, wrinkling, fish eye, orange peel and poor bonding. Technically speaking you can varnish over emulsion, but we don’t recommend it. Turbinaire Compatible Parts & Accessories. No. Wax is a care product often applied to furniture and can be removed with any petroleum-distillate solvent without damaging the finish underneath. Can you varnish over wax? Great coverage on new plaster but does struggle over white and other colours. These are the strongest solvents you can safely use. water-based • Join Yahoo Answers and get 100 points today. My question is what varnish should i be using to seal the paint from scuffs, scrapes and moisture? Use hairspray, it has more uses than you think :) just dont spray too close. ← Older Post Modern emulsion is a great finish but never been back to a job to see if it held out moisture wise. i presume you were using gloss before, gloss is the bad one for yellowing. The dryers and carriers in acrylics and enamels are not as “hot” as lacquer, which means that they will not soften the cured lacquer coatings. dont worry you can still follow this process over your emulsion paint.this would withstand many a cup and saucer. Position a drop cloth underneath whatever you are painting. Can I varnish over the emulsion on the wall behind my cooker, or would the heat damage the varnish? Coating over an old finish has the great advantages of avoiding the always-messy stripping process and greatly reducing the amount of work involved. Any steel shards left behind could rust and cause black spots. something like varnish could badly affect it. you should have used B.I.N primer (red tin-shellac based from b&q) for your first coat and then used an oil based eggshell paint to finish. Step 2 - Prepare the Area. The advantage of waxing over eggshell, is that wax is acting like a sacrificial coat, ie if it scratches it “may” take the brunt of the hit and protect the paint finish beneath.So you would simply retouch in the wax. Lacquer can be used over lacquer-base, non-grain-raising (NGR), and water stains, and over lacquer-base fillers. • Sometimes you can avoid the scuffing step by using a cleaning product that has the added effect of dulling the surface. woodfinishing • all varnish will slightly yellow your paint i'm affraid. Lacquer first, then enamel or acrylic. Also, consider if lacquer is the right kind of paint for your project. The most common type -- nitrocellulose -- is made by dissolving cellulose from cotton in acid and then suspending that emulsion in a solvent. Exposure to light in the higher ultra-violet ranges, such as sunlight and fluorescent light, accelerates the deterioration. Avoid using a finish that contains a solvent that could attack the existing coating. If you varnish over wax you’ll find that the varnish will easily bubble and peel off. There are four types of “dirt” that could cause problems: dust, grease, wax and silicone. Also, the application of a thoroughly wet coat of a product containing lacquer thinner is more likely to cause problems than applying a thin or relatively dry coat. surface • Yeah that yacht varnish is good, pretty cheap too! woodworking • Grease is common in kitchens and can be removed with any strong detergent, TSP, household ammonia and water, or petroleum-distillate solvent such as mineral spirits or naphtha. Or has anyone got any advice on what best to use to help protect the paint from chipping (being used in a Tea room so needs to be hard wearing). You can get a spray lacquer from hardware shops.Make sure you spray in a well ventilated area.hope i helped. With the goal of reducing the amount of time the solvents are in contact with the existing surface, here are some suggestions: No matter what precautions you take, there is always a risk of problems. My wife and I have recently used some emulsion paint - to match our tiles - on the wooden surround for a mirror that is to be mounted in our bathroom. There are exceptions with applying lacquer over some acrylics, but it's not worth the risk of a reaction later IMO. Also, don’t use brushing lacquer. What do you think of the answers? Never try to spray on too much for quick results. Once the lacquer is completely dry, it can be over-coated with enamels and acrylic enamels. The reason the paint didn’t cause problems like blistering or wrinkling is that the solvents included in the paint were mild. You should always us a specialist paint for your job which, in this instance, would be wood paint. Still have questions? make sure the paint is completely dry and light sand with 320 grit. Avoid using lacquer retarder, even if this means waiting for drier or cooler weather. When do you remove your Christmas decorations? just get clear finishes & protector. Shellac is thinned with alcohol, which rarely causes blistering or wrinkling. You can find different types of paint available in the market and it can be selected according to the surface you are painting on, the kind of finish you want, and the level of satisfaction you want to hit. You can put anything over poly, b/c poly is catalized therefore reducers will not melt it. Products that accomplish this include household ammonia and water, TSP and “liquid sandpaper,” which is a mixture of solvents (primarily alcohol) that both clean and dull. For Alclad, they have their own gloss black base coat, but I've seen their topcoats crack over it. Cellulose and acrylic are different films but they aren't incompatible. Spray a couple of light “dusting” coats of finish and let them dry thoroughly before applying a wet coat. There are risks to spraying any type of solvent lacquer over any existing, and older, paint or finish. try it out on a small area and if it goes yellow, take it back, saying you were miss sold it. the finishing store • A wet application can cause many paints and finishes to wrinkle or blister, even an old coat of lacquer itself. However, we know that for many years, modellers have applied lacquers in the form of Testors glosscote/dullcote and Tamiya spray clear gloss/flat over … For water-based finishes, use a compatible “emulsified” fish-eye eliminator. You can get good protection with just a few coats of lacquer, or you can sand it at 320, and keep shooting more coats, The more you sand and shoot, the more the grain will become filled in and you will be on your way to a “Piano finish” if you apply fifteen to 20 coats of lacquer. I have used spray lacquer over paint before with no problems. Just started to varnish and it now looks like Im a heavy smoker..lol..It has gone a yellow/brown colour. You can use one coat to seal the wood. This forms a barrier over the acrylic without it being too aggressive (if you apply a heavy wet coat directly to the acrylic base, it will almost certainly "burn through" and damage the underlying paint). Apply a barrier coat of shellac between the existing surface and the coating containing lacquer thinner. Lacquer provides a subtle, durable coating, and offers one of the best wood finishes available. Emulsion is a type of water based paint that is usually used to paint interior walls and ceilings. There are several things to consider when lacquering over painted wood. Apply a number of very light "mist" coats using the spray lacquer, allowing each coat to dry before applying the next. Dirt can be applied over lacquers and acrylics can be over-coated with and. 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