In my limited experience the heat paints seem to be slightly better quality. There are 2 sorts. Hi temp for headers etc and engine enamel which is just OK for mufflers. Yeah - they work better once they have been heat cycled.
Using std plasticote 'enamel' rattle cans and hoping for a decent finish is a bit hit n miss. Some cans just come with shitty nozzles….
What we used to do was shake the fuck out of them and sit them in warm water for a few minutes (not too hot or too long) to thin the paint a little and increase pressure in the can.
The acrylic lacquer paint you can buy is generally better but you need the whole ‘system’ and it’s fussier about atmospherics. Gives a better gloss if you get it right though plus you can get a bigger range of colours and some places used to mix it up to order.
I just use a cheapo compressor and spray gun to shoot lacquer. It’s a lot cheaper.
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