adding thinner to paint

It can be anything you want, depending on the total quantity to wish to wind up with - teaspoons, 8 oz drinking cups, pints, quarts, etc. The important thing to remember is that whatever measure you use, you mix at a ratio of 8 paint to 1thinner, at least for your particular paint. That means for 8 teaspoons of paint, you add 1 teaspoon of thinner to give 9 teaspoons of mixed paint. If you were using kitchen measuring cups as I do, it would mean you add 2 oz of thinner to 16 oz of paint for 18 oz of mixed paint - or 1 oz of thinner to 8 oz of paint for 9 oz of mixed paint. And so on. If you want to use the whole gallon of paint, you would add 1 pint of thinner to it. That would give you the 8 to 1 ratio since 1/8 of a gallon is 1 pint.

Rod