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By all means contact Gamblin and see what they have to say. Gamvar is designed to be easily removed (compared to traditional varnishes like Dammar) with mineral spirits (Gamsol!). This is a major reason that conservators favor it.
Personally, I don't think that applying a second coat of varnish over the first was such a good idea. W hen you apply varnish over a slick surface there isn't very much for it to grab on to! Why put two pieces of glass over a picture? Also was your painting lying flat when you applied the varnish?
When you apply the varnish you have a reasonable amount of time to go over the coat and smooth it out. Sometimes certain areas don't cover as well because of different degrees of oil saturation in the paint layers and some small dry spots may open up. Just give the the varnish a couple of minutes to begin to set up and go over the dry areas again without adding new varnish to your brush (sometimes you might have to add a little).
Continue this procedure until the varnish bridges the dry areas. This technique works for me and the results are always terrific. I also add some Gamblin wax medium to cut down the gloss (2 tablespoons per jar of Gamsol). Good luck.
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