I found it was harder to get an even 2nd coat on awkward parts that were still hot. So I let them completely cool, and that seems to work great. I still get a fine static charge and it coats really evenly...
I don't do any prep, just let it cool, spray again, and rebake, no issues.
As for cleaning the gun, I always just use compressed air, and totally overdo it. I got a bit of red contamination while spraying yellow, and it was not an appreciated effect.
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