nice exit1965, glad to hear the professional worked out for you. i really think that it is a CA thing, other people have no issues with the standard rustoleum. as for mixing the quarts together, it could'nt hurt, but i have to say at least with the tremclad i bought a can 3 years later to repaint a fender due to parking lot damage, and the color was an exact match. also i know that some stores carry only quart cans, like the tremclad i had to go to 3 stores before i found it in a gal can. exit-start rollering that damm car, i saw in the pic how badly it wants a nice coat of paint and get out of that damm garage!!!