Re: Painting Question, if I may?
Wax on exterior painted surfaces is the normal sacrificial protectant. If you don't use wax, you use a polymer polish or other material which is harder to remove. Or you leave the paint bare and UV breaks it down.
So the cheapest best solution is to use wax, and then when you want to repaint, that's why the good lord invented PrepSolv and terry rags, so you can strip the wax off easily and completely, the way that every paint shop does with every car, boat, and plane for every repaint job.