If you're buying paint from a professional paint supplier, please don't forget to check the mix ratio. Not doing this is like trying to bake a cake with no recipe. The paint stores supplying body shops are going to sell you full cans of paint, full cans of reducer and hardener and expect that you know what you want and how to mix it. Not paying attention to the ratios can and usually will cause you to buy the wrong amount of paint. I point this out because yesterday I was at English Paint and a person was complaining he had bought too much paint (which obviously isn't returnable). He apparently hadn't considered the mix ratio at all.
For example, I am spraying some catalyzed PPG paint and it is based on a ratio of 8 paint, 6 reducer and 1 hardener. (Be sure to ask for the proper temperature of reducer as it will make a difference in your work--right now you need medium temp reducer or 70-85 degrees) Say if you wanted to have 7 sprayable quarts and the ratio was the same as the PPG above, you would need to buy 4 quarts of paint, 3 quarts of reducer and 1 pint of hardener. For the math experts, yes, this is 7.5 quarts, but you're going to lose a bit to overspray, cleaning, paint sticking to cans, funnels, strainers, stirrers, etc so you want to factor that in also.
Good luck!
