Preservation/Conservation varnishing question

Terry Hart cpf

SGF, Supreme Grumble Framer
Joined
Sep 23, 2003
Posts
2,075
From
Excelsior, MN
It's just come to my attention that both Liquitex and Golden (not the brands of varnish I usually use) reccomend first varnishing an acrylic with water based gloss polymer varnish as an isolation barrier before varnishing with a solvent based acrylic resin varnish. I find no such reccomendation from Gamblin or Winsor Newton.
What do you think. A good idea for the art or for selling more product?
Why would it be neccesary to do this?
 
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