Not true for all paints, my dads shop which is using water based technology one of the VERY few shops in north america (other than the big name car manufacturers) Theirs takes 90 days to completely cure if I'm not mistaken. Both of my builds that were painted were painted with automotive paints, and the finish is immaculate, no problems what so ever. You will need far less coats of clear coat as well as opposed to lacquer, etc. You will have orange peel, but if you wet sand with 1500 after the first clear, then lay down your second coat, it will be far less if not completely gone. If it is still there wait 2 weeks and wet sand again if you want it completely gone.