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Reply by Tedster

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Posted on Poly over Zinsser amber Shellac?

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Tedster

2272 posts in 931 days


#1 posted 06-26-2012 03:56 AM

In many old houses I work in, poly had been applied over the old oil varnish and had since alligatored. What happens is the oil varnish is slightly viscous but the poly is not, so the poly cracks and floats around like sheets of ice on water. I don’t know about shellac but that may be the same situation—it may look good now but it might eventually alligator.

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