You can skip the baking step by using one of the auto epoxy type paints. Epoxy paint hardens by catalytic reaction. These paints are bomb-proof after they cure. Some of these paints are available in spray cans, but most are sold by the pint/quart and require spray equipment. The more durable paints are two part affairs that require mixing prior to application. Look in the yellow pages for a local auto-body supply store -- not a parts store.