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Forum topic by woodnut posted 1923 days ago 464 views 0 times favorited 2 replies Add to Favorites Watch
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woodnut

388 posts in 2554 days


1923 days ago

I have made and finished a T.V. stand to go in and existing entertainment center. Now the problem. After I installed the stand I find out that it needs to be a little darker. It has poly. for the final 2 coats and I am wanting to know if I can now add a couple coats of shallac over the poly. without any problems? I am almost certain that a couple coats of orange shallac will get me to where I need to be. Any advice would be greatly apperciated. Thanks in advance.

-- F.Little


2 replies so far

View Greg Wurst's profile

Greg Wurst

777 posts in 2334 days


#1 posted 1923 days ago

I had a similar problem, and used a citrus finish stripper to remove the poly and most of the stain. Not sure how well shellac will go over poly.

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View Gofor's profile

Gofor

470 posts in 2289 days


#2 posted 1923 days ago

Let the poly cure for a couple days, scuff with 320 or 400 to break all the gloss, and then the shellac will be okay. Realize that the shellac will not be as hard as the poly, so any scratches, etc, may cause the coating to break along the poly/shellac interface.

Another option would be to add some toner (dye) to the next coat(s) of poly until it gets dark enough. Black dye will darken it but it won’t take much, although you may do better with orange or brown to match the shade.

As long as the poly has cured (is not out-gassing which can be told by sniffing it. If it smells like solvent or resin, it is still out-gassing), the alcohol which is the solvent for shellac will not hurt it. On the other hand, lacquer thinner, which is the solvent for lacquer, may cause bubbling, or softening of the poly (which is really a varnish), so I would not use lacquer unless the poly has cured for several weeks. In any case, try in an inconspicuous spot to test first, and spray light coats.

HTH

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