I'm painting an exterior patio cover on my house. I want a rich clay red to match the tile roof. I'd like to go with a semi-gloss latex (in CA laytex is all we get) but one of the guys who is bidding on the job insists that flat paint will weather better. So far, I can't find anything to corroborate this claim. In fact, it looks as if semi gloss will hold up to the sun and rain better. Any painters out there who know about this?