Reply by Ted

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Posted on Poly over Zinsser amber Shellac?

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2714 posts in 1372 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.

-- There are three types of people in this world... those who make things happen, those who watch things happen, and those who wonder what happened.

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