Just a tip for everyone who keeps saying "IM BAD WITH FRACTIONS" or saying fractions are difficult.
When they show you those fractions, say, 2/3 Rusto, 1/3 Thinner. These are called "parts." So no matter what size of cup you use, you can just add 2 of Rusto, 1 of paint thinner. It doesnt matter if its a measuring cup or the bottom of a coke bottle. Just take the first number of the fractions, and thats how many you add.