Yes it would work. Enamel clear coats can yellow over time. I wouldn't use it over light cool colors.
If you want to expand into the hobby more, you should considering looking for nearby hobby shops, or online hobby shops. They sell many different types of gloss clear coats.
Another option is to pick up some Future at Wal-Mart. It can be found with the other cleaners/waxes and cleaning tools in the grocery section. It is an acrylic floor coat and not a wax. It is basically the same thing as clear acrylic paint, but dries slower and has better self leveling properties. Just apply a coat of it using a brush or airbrush and cover it with a plastic container to dry lint free. Multiple applications are neccessary for high gloss finishes.