this is the first time i've ever painted anything. i'm painting a B16A valve cover and it came out well, minus for a couple sides that are still unwrinkled. I did this last night and let it sit all night to air dry. I've got a 5 coats of paint on it as the can stated to keep painting the sides that are not wrinkled or look uneven. am i doing something wrong? do i have to bake it before it all wrinkles up or does it wrinkle after air drying, then cures after baking?