Hi - I am going to help my son in law clad the back of his van for work - he's a plumber so carries tools and some spares etc. Does anyone feel there is an advantage of MDF over Plywood? My thoughts are MDF is heavy and prone to the damp, but could be made water resistant by painting in watered down glue. The waterproof version is very expensive. Or is Plywood a better option, I think so but he is not so sure? Any views gratefully accepted, Jinx