if you buy paint at an automotive store you wont need to paint it w/ primer. its like $3 to $4 a can. then just clear coat it if its not glossy black. for me what i did was cleaned the heatercore w/ by sanding it and vinegar. then just painted it. didnt use a primer or anything. the paint cost like $1, the cheap spray at home depot and i had some existing clear coat. looks great, paint is dark, and shiny. its not like paint is falling off of it or anything w/o primer and i've had it a/b 3 months now. no probs. dont paint the fins tho.
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