I understand that some finishes will not adhere well to shellac that is not dewaxed. I have a chair finised with non-dewaxed shellac, and I would like to put a more durable finish on it. If I applied a coat (or two or three) of dewaxed shellac over a non-dewaxed shellac, will a top coat of polyurethane or varnish stick?
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Replies
I would say "probably not". The thing with shellac is that it is dissolved in alcohol, and every time more shellac is brushed on, the alcohol in the new coat partially dissolves the previous top coat. Because of this, every new coat you put down will have some of the previous coat mixed in, and in your case, this means waxed shellac will be there too.
On the other hand, it may be possible to avoid this by spraying the shellac on, but since I don`t have spraying equiptment myself, someone else will have to help you there.
You can use a non-poly varnish with no problems with adherence--and probably get a better looking finish.
What sorts of finish would go over shellac and adhere properly? Thanks- Dave
As I said, a non-poly varnish. Pratt&Lambert makes one. You have to go to a real paint store and read the can.Gretchen
check this place out !
http://www.josephfusco.org/
click on articles and scroll to the bottom, I don't know if others will agree, but this fella found that the poly will stick to either shellac.
maddog
Two coats of dewaxed shellac should work, check out a finishing forum for a more informed opinion.
mike
I agree that a couple of coats of dewaxed shellac should take care of you situation. I find dewaxed shellac can take care of a lot of finish problems.
If you want the experts opinion, ask Jeff or Paul at http://www.homesteadfinishing.com
Chuck
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