First of all I hate to paint. I rather clean the toilet of some of those people on that hoarder show. My boxes get 2 coats of Zissler primer and 2 coats of super duper paint I get for a buck. I do get paint on the upper lip of my boxes. It seems even though they are dry I need to take a sledge hammer to break loose. My bro said to use the homemade butcher wax and rub it in. (Beeswax and food grade mineral oil). I really don't want to scrap or plane the paint off. Think this will work or anyone have better idea.