B-I-N, developed in 1946, is the original shellac-based white-pigmented primer-sealer stain-killer. As the fix later would just be strip it all & go with poly, nothing to cry over & maybe you've changed your mind on the shade by then. Shellac is a wonderful tool for solving refinishing problems. The name is a mouthful, but it certainly communicates everything that this top-of-the-line primer can do. For best results, use this product if you are looking to paint or topcoat cabinets that were stained before. It blocks silicone contamination, which causes fish eye, odors (for example, from smoke or animal urine), and residual wax extremely well. This would be wrong. The shellac does not have to be dewaxed if you plan to use oil-based paint. Seeing its market disappearing, Zinsser (Bulls Eye), with the help of some woodworking writers, turned shellac into a sealer, even introducing a dewaxed variety (SealCoat) that was marketed for use under polyurethane. Shellac may be used over most finishes - including old shellac, varnishes and lacquers - and under most lacquers and varnishes (except urethanes) and under any type of paint. It only takes a minute to sign up. Generic water-based polyurethane for concrete desk? Is solder mask a valid electrical insulator? Or will the shellac with its natural wax still included work just as well? Can I draw a weapon as a part of a Melee Spell Attack? Dewaxed SealCoat is two-pound cut, which is no longer listed on the label. It’s also great as a finish when you want to replace an original 19th century finish with the same thing. Shellac continued to be used by painters and floor finishers working inside buildings and by amateurs until the 1960s. © 2021 Cruz Bay Publishing, Inc. an Active Interest Media company. Does water based polyurethane affect the color of paint? Essentially a plastic in the form of a liquid until it dries, polyurethane is available in … Woodworking Myth: You should never put a water-based finish on top of an oil-based finish. Just add some retarder. Another concern is whether it will stand up to the heat adjacent to the stove. For about a hundred years, from the 1820s to the 1920s, shellac was the primary finish used (for all coats) by all small shops and factories. Thanks for making that point. In most cases, one coat of primer is enough. One stellar offering from Zinsser is their Bulls Eye 1-2-3 Interior/Exterior Water-Based Primer. Shellac primers can be great for painting over trim and smaller projects because it dries hard and blocks stains. Before you even get started, you have to learn the different types of shellac. Because the solvent in shellac-based primers is denatured alcohol, these primers kill the bacteria that … It can rid of pet stains, smoke, plus musty odors. Cleanup is with mineral spirits. Either oil or water-based primer can be used with water-based paint. Shellac is a difficult finish (or sealer) to use. Unless you thin shellac a good deal, it has a tendency to ridge at the edge of brush strokes and orange peel when sprayed. Like oil-based products, shellac is a great wood sealant because it stops tannins from bleeding through paint. In addition to water-based primer, there are oil- and shellac-based primers, both of which have bases that do not dissolve in water. If all this isn’t enough to make you question the wisdom of using shellac as a sealer when you don’t have one of the problems mentioned, consider that shellac is a relatively difficult finish to sand. Where to keep savings for home loan deposit? Does this sound like a viable plan? Please forgive my ignorance, but I still don't see where the quoted above says specifically that it can be used over an oil-based … Does oil-based polyurethane have any residual toxicity past setting? Many shops use oil stains to get the color they want on projects. The problem with paint rollers is common across all types of hard . This will lay a first layer of velcro-like surface on which the paint will stick. A third issue is shelf life. Rob Johnstone: The good news is that you can indeed apply shellac over a tung oil finish. After the shellac has deteriorated a few years in the can, the finish you apply over it may wrinkle. First, let’s clarify which products we’re comparing. When it softens with water, it has a tacky feel which is a magnet for dust. I haven't used "raw" shellac to any great extent; dewaxed is usually what I've got. How hard should water based polyurethane get? Oak is particularly notorious for this. Shellac with wax in it is less compatible with other under/over finishes. I am ready to finish the project and I would really like to not screw it up. Should you be using that? It gums up sandpaper unless applied very thin. It can go over, or under, either. 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