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Oh, yes; Krylon also sells a couple of good spray varnishes -- both are on the "conservator-approved" list (my term) of synthetic acryloid resins: "Crystal Clear", a hard varnish, and "Kammar Varnish" which is a softer, dammar substitute, as they claim.
Finally, Rembrandt Picture Varnish is another one I know of that uses a good, non-yellowing synthetic resin (this time, a polycylcohexanone; Larapol K80) but I haven't used it. Beva, a manufacturer of museum conservation materials, also has a reversible picture varnish. It might be one the best, along with Gamblin's, but it's hard to find, and probably only available in large quantities.
Any of these that we've mentioned should serve you well and you needn't turn to a photographer's product. Not that there's necessarily anything wrong with that (assuming it isn't a true lacquer) it's just that there are already a number of available varnishes specifically designed for oil paintings.
Best.
Juan
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