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Dear Richard,
There's a discussion about using Liquin as a final varnish in the "Letters" section of the June 2003 issue of American Artist. The consensus seems to be that one should not use the same substance in both the paint medium and the final varnish, since the solvent used to remove the old varnish when the painting needs to be cleaned will also remove the paint itself.
In other words, if you're using Liquin as a medium, you should not also use it as a final varnish, but if you're using a medium other than Liquin, go ahead and try the Liquin. Another letter writer suggested using the medium used in the paint as an isolating layer before the final varnish, meaning that you can use Liquin as a medium, isolating coat AND final varnish. (I guess.)
I started using Liquin to speed things up when I did a lot of plein aire painting. Later, I stopped using it as a medium and used it solely as a final varnish. I have never had a problem with it except that I now find it too "ridgey" for my working methods. Since I've gotten to the bottom of my bottle, though, I'm going to try Gamblin's Gamvar or an acrylic-solution varnish next. UVA protection sounds like a good idea to me.
Liquin is one of those topics that invites passionate debate.
Best regards,
Linda
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