Barb, get yourself some of those graduated plastic paint cups in various sizes. They make them in quart all the way down to several oz sizes.

Then take the bigger cup and figure how much paint you are going to use for the job you are doing. You would only mix up a quart if you were going to use that amount, for smaller jobs you mix less.

For example, 8 oz of paint + 2 oz of reducer + 1 oz of hardener yields 11 oz of ready to spray paint.

16 oz paint + 4 oz of reducer + 2 oz of hardener yields 22 oz of paint.

etc, etc.

Only mix up as much as you need so you don't waste the whole quart.

Don