your local Napa has auto grade paint and can often special order certain colors.
Not sure what they will charge for that though, I stopped going to my local one they were so expensive without
a commercial discount.
I agree with Ray, particularly if your main desire is durability, not a show tractor finish. Which it unlikely had in the first place... For me, it's all in the prep, and I know that is a timeworn issue. Today's one part enamels sprayed over a well prepped and primed surface will really do a nice job. But if you want to dazzle with your finish, you may have to spend well over a hundred bucks a gallon to get there.
We have a car painting franchise near us, Earl Scheib, I think they are still around, and they are always offering a half off paint job for two or three hundred bucks. And boy they look shiny coming out. And one year later they are peeling and flaking off, sometimes in large sheets. There are tons of cars around here peeling away and you just know it was a cheap paint job. No prep. Prep is costly, and you sure won't get much for three hundred bucks.
This is the long way around of saying if you prep well, a less costly paint should work very well. I owned an old boat and did a fair amount of painting over aluminum and fiberglass. I sanded the fully aluminum entrance doors down to a super clean finish, put etching primer on, and then topcoated with three coats of rattle can Rustoleum Commercial silver paint. Absolutely looked like new. And five years later, even in salt water use, not one bubble on those doors, and I was just waiting for them to start. The quotes I got for commercial painting of the doors were staggering. But then it was a boat.
But it proved to me with my own eyes that top quality rattle can paint really will last.
