Shellac Over Polyurethane
Here s how to successfully paint over polyurethane or other finished wood.
Shellac over polyurethane. I have heard countless times that you should never put polyurethane over waxed shellac. Polyurethane and waterborne finishes can go over shellac if it s dewaxed shellac. Minwax polycrylic is an example of a fortified water based polyurethane than can stand up a bit better to rough conditions.
This is because the most popular types of topcoats varnish lacquer polyurethane and shellac have advantages and disadvantages which makes them best suited for particular types of settings. Sanding is especially important if you plan to stain the wood a different color instead of painting it. The finish on many antiques is shellac and it s usually the best finish to apply to your antique.
But there have been so many occasions where i. Polyurethane and varnish vs. Lacquer spraying on another coat partially dissolved the coat underneath leading to.
It also can go over oil based finishes and can be applied using synthetic. Both waxy and de waxed shellac will go over polyurethane varnish with no problem but if you intend to put on more poly for some reason you should use de waxed. It s one of my least favorite tasks in any diy project.
I keep things simple and only buy dewaxed shellac so i don t have to keep dual sets of brushes etc. Shellac is a clear gloss finish that comes from the secretion of an insect and is mixed with alcohol. Lacquer waterborne polyurethane close second place.
A coat of shellac can be placed over polyurethane. Shellac 1 hour waterborne polyurethane 2 hrs standard polyurethane 24 hours best for crystal clear finish. Now i have always taken the better safe than sorry route simply avoiding regular waxed shellac.
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