to answer your specific question - non of the aluminum sheet roofs that I've seen are coated or painted with anything (other than sealer around the edges and where any wholes are drilled for fans, sat dish, vents, etc).
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Don R.
'04 Haulmark (M42386) 42', 2 slide, 10kw - Pictures
'04 F350 CrewCab Longbed 4x4, 50g aux tank & gear vendors dbl over
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