Reply by Fred Hargis

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Posted on Polly over shellac

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Fred Hargis

5838 posts in 3058 days

#1 posted 11-16-2018 11:37 AM

It’s what OSU55 said, the adhesion problem is why it’s often suggested to not use shellac under urethane finishes. But the problem isn’t actually the wax; it’s the urethane resins, which tend to inhibit adhesion. So using dewaxed shellac solves the problem, or using any finish that doesn’t have urethane resins. If you use an alkyd resin varnish (P&L 38, or SW Fast Dry Oil Varnish) it doesn’t matter what shellac, if any, you put under it. It should be said, there isn’t a guarantee you will have problems if you put urethane finishes on top of waxy shellac….just that you might have problems. But the risk isn’t worth it to me, so it’s the old ounce of prevention beats a pound of cure thing.

-- Our village hasn't lost it's idiot, he was elected to congress.

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