Are you repainting it a whole different color or just the same color? If you're doing a color change, I'd get at least 1-1.5 gallons of base paint cause after reducing it, you'll have 2-3 gallons of paint depending on the mixture ratio. You might not need it all, but it's good to have some left over just in case if something goes wrong. As for clear, you'll probably be fine with just a gallon of clear.
Gallon color plus reducer and one gallon clear more than enough for that car as long as you use a proper sealer that will blend well with your color it will make it easier for coverage PPG DBC is awsome paint and for clear DC4000 or 2042 the dbc paint is a 1 to 1 mix so a gallon will make 2 after reduced so you'd have plenty left to
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