You need to use a good quality etch primer as you can't really prep the fins properly without damaging them and normal paint will just fall off eventually.
There are certain types of paint that will transfer the heat off the intercooler better than others. IIRC the stock oil cooler and intercooler have some type of paint like what I'm talking about on them...
If i was you i would use radiator paint since it is made for that same sort of thing. If you used spray paint that is too thick it can clog up the spaces in between the fins.
Yo mike, I used some rustoleum flat black primer and just shot a super thin layer on my 240sx intercooler and it worked:icon_bigg :icon_bigg great. Your car looked sweet in person when I saw it at Jose's shop!!!
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