Thank you for your " formula change" info, Bob. I still have several cans of Warbird Colors that I have used w/ the fuel proof additive. Finding out the additive won't work with the "new" stuff may have saved me some real problems since I had intended to get some more colors. Do you know if the old formula paint can be mixed with the new formula paint if someone one doesn't add the fuel proofer ? Thanks much, 'buff