The galv chassis for my land rover arrived two years ago. As yet I havent found time to get to it and its sat in my shed since delivery. The paint I have bought for it says that the undercoat needs the galv to have a light rub down with scotchbrite. I read in some places that letting the galv weather will do.the same job..? Will it have 'weathered' sat in my shed for two years? (For some reason I cant get going with this project... I guess I am not enamoured with the idea of spending days rubbibg down!)