Deve, I think I had figured some of that out. The problem for me is how do you measure .25 oz of catalyst or the smaller amounts of paint like 3.75 oz. I can't find any measuring spoons that go that low. The smallest measure I can find is 1 ounce. I'll have to go get one of my paint cups (PPG) and see what the other posters are talking about using parts. I'm learning a lot. Thanks everyone for helping.