Lani,
Sorry, I have no experience with Gamblin Gamvar, so I wouldn't know if it has the same properties as damar.
Claudemir,
I use the damar because I find it brushes on easily because it is relatively non-viscous, and I read somewhere that it is the best of the soft resins to use as a varnish. I prepare my own (huge savings) and I also use a little of it mixed with my medium at times to quicken drying time of the oils. As a varnish it can discolour if the resin is not too pure, though, but some might like the aged look it gives.
Carlos
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