I just got a new Wagner portable spray painter and had a hair-brain idea. I have this huge 9'X9' bimini that stays open all season. Rather than treat it with typical pump spray dispensers, i.e. pump, pump, pump, how would loading up the spray tank and just pulling the trigger work? I think I could regulate it. It's made for paint, stains etc so sunbrella products should not hurt it. I might even be able to order the product in larger refill sizes. Is this crazy?