Can you put polyurethane over dewaxed shellac?
It’d be a crying shame to cover up that old wood with plasticy polyurethane!!! You can wax over shellac, even dewaxed, as the wax will bond to the wax (even the trace amounts) in the shellac. A few good coats of paste wax and you are set. With water rings, they are much easier to repair in a shellac/wax finish.
Can shellac be used under polyurethane?
Simply put, shellac covers all. Working the other direction or when you apply other topcoats over shellac, it is often noted that you should not apply polyurethane over shellac. It is, however, OK to use an oil-based urethane over shellac.
Can you put epoxy over shellac?
Dewaxed shellac is a pretty universal sealer, anything adheres to it, including epoxy.
Should I sand shellac before polyurethane?
I have used poly (oil based, not water) over regular (waxed) shellac without any problems but you must sand/scuff to give it a good physical bond. If you don’t need the amber tone, the Zinsser’s sanding sealer is dewaxed so that’s even better.
Is Zinsser clear shellac Dewaxed?
Both amber and clear Bulls Eye shellac have a natural waxy substance that interferes with the adhesion of oil-based polyurethane and water-based finishes. To address that problem, Zinsser created SealCoat, a dewaxed shellac, meaning it has the wax removed.
What is dewaxed shellac used for?
Dewaxed shellac is an ideal sanding sealer. It bonds tenaciously to virtually any bare wood or finished surface; it dries very quickly, sands smooth with the greatest of ease, and since it contains no stearates it provides a reliable base for any kind of finish going on top.
Which is better polyurethane or shellac?
If you want to be environmental-friendly and look for a more natural look, then shellac is a suitable choice. If, however, you need a modernistic look to your wood and you want a clear finish, then polyurethane varnish will satisfy your requirements.
Can you use polyurethane over waxed shellac?
Poly works fine over shellac, either waxed or de-waxed. Shellac happens to stick to just about anything. The “SealCoat” shellac another poster mentioned is from Zinsser, not Behlens. It’s basically a 2lb cut of dewaxed shellac, and very economical versus making your own from flake.
Can you use shellac as a sealer on wood?
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. But here we return to the central question: Why not use polyurethane itself as the sealer? It “seals” the wood perfectly well.
Are there any polys that do not adhere to shellac?
There are plenty of polys, including practically all waterborne polys, that do not adhere well to shellac containing wax. But even the waterborne polys with adhere to shellac.
What’s the difference between flaked shellac and dewaxed shellac?
The tradeoff is that dewaxed Powder shellac is made by a chemical process that produces a bit more contaminates than the natural process used in producing flaked shellac. The contaminates are easily removed with a paint filter prior to using. The powder produces a clear hard surface that shows the true beauty of your exotic woods.