Use caution "baking" painted things in the sun. "Baking" can cause the paint to blister, as the paint surface skins too quickly to allow the paint vehicle to evaporate through. All of a paint's characteristics are a function of its drying/curing time, if you retard that natural/gradual drying time, you can damage some of those characteristics, like sheen, color, bonding, abrasion resistance, etc. Air drying, out of direct sun, is the way to go.