Its just standard car solvent based 2k, its a semi gloss they use for wheels.
I took the front cover of and had it blasted,that is pock marked badly,was gona powder coat it but couldnt be bothered.
As Bendy sez acid etch primer and then lash it on, wet on wet is the term they use.
Oh and before any comments about heat,just think how hot car bodywork gets in the sun.