Greatly depends on the mix ratio. If you do a gallon at 1:1 then you have 2 gallons of paint available to shoot, if 2:1 then it's 1.5 gallons. I can say that in the past I shot a '66 Chevelle coupe, had one gallon of lacquer and mixed it 1:1 - I didn't have enough left to fill a Dixie cup, but it was a yellow over grey primer - it took a lot of paint to get coverage. I think most people say the average sized "older" sedan is usually good with a gallon of color.
I used to sell and repair E-Z Go golf carts. Touched up and repainted a lot of frames and other parts (bodies got regular automotive car paints as required). I used Van Sickle, Rustoleum and Valspar with the Valspar or Majic hardeners and some time the 2 mixed together. I also used it in my primers. Not once did I ever have a problem. Mostly used with the satin black or silver, but other colors too. Acetone or naptha to thin. No problems ever.
Rust doesn't but the hardener is supposed to help. You can also spray clear over rust but if you're doing that might as well BC/CC it to start with.
A good black alkyd enamel is from your local CAT dealer, flat, low gloss and gloss. I used hardner them all and never had a problem with to much gloss on the flat or low gloss black. Valspar manufactures there paint.
I've done almost every build using Rustoleum for the frame and inside and outside of the floors for decades. Sometimes gloss black, and sometimes 50/50 mix gloss and flat to get satin. They don't sell gallons of satin anywhere around here, so buying a gallon of gloss and flat gives me what I need. I like the 50/50 mix result, as I think flat is too flat. Sometimes I do just straight gloss, instead of the mix. I've pressure washed, and scrubbed my undercarriage on my '37 Austin for over a decade, and it still looks like new underneath.
POR15 direct over the metal, light sand, and then Rustoleum Satin over that. The POR15 is so much more durable than any spray bomb, then the satin just finishes off the right color and texture.
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