Finishing Facts -
Poly. Varnish, Shellac
by Howard Acheson
Let's be clear.
Poly varnish can NOT be applied over shellac that contains wax.
Knowing that most shellac contains wax, poly manufacturers say not to apply over shellac.
Poly varnish can be applied over a dewaxed shellac.
Poly varnish can be applied over lacquer providing the lacquer is fully dry and has been
scuff sanded for adhesion.
Regular varnish can be applied over shellac that contains wax.
Zinsser standard Bullseye shellac DOES contain wax.
Zinsser Spray Can shellac does NOT contain wax.
Zinsser Sealcoat is a shellac that does NOT contain wax.
Thanks to Jim Kull... one of the original developers of the wipe-on process.
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