Furniture, Wood and Cabinetry Finishing - poly over shellac?

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lam
02-21-06, 01:32 PM
I have some old chairs which I believe have an old shellac coating on them. (I am able to remove the finish with denatured alcohol and a bit of rubbing.) My question is: is it possible to urethane them after I have removed most of the finish the the alcohol or a 50-50 solution of denatured alcohol and lacquer thinner? I'd like to use them with the oak table that I am doing.
Thank you

marksr
02-21-06, 06:14 PM
More than likely. I don't recall ever having gone over shellac with poly but I have used varnish over shellac with no problems. The times I have coated shellac with varnish the shellac finish was old and worn and a light sanding was bascily all the prep given.
noleguy33
02-23-06, 10:47 PM
I don't think you'd have a problem, but I'd use a sanding sealer first(specifically SealCoat) just to make sure it would work.