We have a water proof deck over our garage at our So Cal house. It is a system of galvanized metal lath, acrylic modified cements, fiberglass, and a pigmented sealer. It had to be applied by a deck coating company. It is UV resistant and has held up quite well so far (was applied about 6 years ago). It wasn't cheap though.
Google "waterproof deck coating" and you'll see several products.
JHAP ~~~~~~~~~~ "My mind is a raging torrent, flooded with rivulets of thought cascading into a waterfall of creative alternatives." ...Hedley Lamarr (that's Hedley not Hedy)
