I would get 2 quarts of the green for the body and one for the top. It’s better to have a little to much, because to have them mix more later it could be off in color a little. I would also have them mix the 2 quarts in a gallon can. The black I would start with 2 quarts.

Denny

Thanks Denny.

I would be getting a total of 3 quarts for a complete outside (if  multiple colors as Dennis suggested get more than you think of each color).

Tony 

Thanks Tony.

Should I use a sealer before painting with single stage? Everything will be primed in one color, Grey. There is no old paint that I am going over. I have heard that if you are painting g dark colors (which I am) that a dark seal coat is a good idea. Any thoughts?

Thanks

Ralph

As a rule you only need sealer when you're top coating over something that could affect the top coat and the sealer needs to seal it out. For instance a light color top coat over a red. Reds are infamous for bleeding through. If you've gone to bare metal and everything is primed I don't see the need but others may have differing opinions. My last personal experience professionally with a paint gun was a long time ago.

I painted my 31 and ended up using a little more than suggested but I had a good bit of rework, especially on the black fenders.

Dave 

I have not used sealer when painting cars, only a primer and had no color bleed through even on prepainted surface though I have heard of it happening. I should note I am not a professional painter.

Tony