i have friends that tried the G2 system and they seem to be happy with it. Its one of the more popular brands out there.

what i do for myself is to get some black or silver high temp automotive spray paint. it's a much thinner coat and doesn't look like a heavy hand painted coat epoxy stuff. however, the spray paint isn't meant to last up against brake cleaner or brake fluid like the epoxy is... i know dave zeckhausen uses spray paint here and there also...