I would say you never waxed it. It sticks like shit to a blanket when you don't want it to but when you do it will fall off unless you prepare the surface...good fun aint it

If taking a splash mould then wax 3 or 4 times and pva if not sure on the surface.

If repairing then badger the surface with gritty paper to key it then wipe with acetone to remove the wax present in resin/gel coat.