Hello, Nick,
Is "Carter's" Jim Carter Truck Parts?
What paint line does your painter like to use?
Does your painter buy paint locally, or does he/she get it shipped (from whom)?
I think it is recommended to use same-vendor products, if possible.
I like PPG products, but other people like other product lines.
Jim Carter sometimes uses Dupont Centari. I bought paint from him once, many years ago, and stopped buying from him because back then he would not indicate the paint line.