But I can not add talcum or corn starch to the spray cans, can I ? I have to go to another town half an hour up north to order it, and then pick it up a day or two later.
nope, not unless hey are willing to add 50 grams ......hmmm less than that for spray cans (typically about 1-2oz of spray able paint,that would be ) ... I'd say 5 grams of talcum powder to the paint mix before they put it into the can.
I can relate to the hour and a half drive, I'm in the sticks and it 25 minutes or more to anywhere for anything, my nearest painter supply is 1 hour away and they don't mix special colors anymore so it 80 minutes to the next one (of course it not in the same direction so 1 hour plus the 80 minutes)