Welcome aboard!
Never tried gesso, myself. If it is an acrylic medium, I'd say you are fine. The Krylon Fusion line is an acrylic, I believe, which is why it works well on action-figures. Just stay FAR AWAY from enamels!! They are great on models, but not on figs. I use the 2oz bottles of brush-on paints you get in WalMart's craft section (and real craft stores, for a HUGE selection) like Ceramcoat, FolkArt, Apple Barrel, and the like.
I'm interested in hearing your experience with the gesso, though.