Chuck, baby powder will work in a pinch for opaque coatings. Most commercially made coatings use some sort of silica mix for the flatting agent, and the environmental watchdogs in CA have made it more difficult to get those coatings. Up to a few years ago, one could buy flatting agents in 50 pound sacks from paint manufacturers, and then blend your own coating to get exactly the finish desired. Now, one must bring in the flatting agents from AZ. I think it's legal as long as it's not for commercial use.
