I rattlecanned my Formula when I was about 20 (abt 1985)… in Krylon gloss black. Went over the car at least a few times, again and again, at that point not expecting a consistent finish. The main thing was to get a thick coat that didn’t have runs if at all possible. Used many, many cans of paint. After a few days, I wet sanded it, then used rubbing compound. Re-shot a couple areas where the black was too thin and wet sanded/compounded again to even things out. After that I used polishing compound and finally waxed it a few times.
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The results were pretty amazing. Inended up adding (2) white 9″ wide stripes the whole length of the car, oriented with the Ram Air scoops on the hood.
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The car looked great. Wish I had pictures of it.

Thats interesting, but seems like may more work than I’d want to do by hand. That and on plastic pieces I dont see it being able to flex in the heat or cold.