Primer or no primer on chassis parts

[Kurt in NJ]

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Although it isn't model A part(it's for Mertcedes G wagon turbo diesel conversion), it is painted with epoxy primer over media blasted metal treated with "Picklex 20" ---not quite a full gloss, more of a semi gloss

I was reading in the Fastenal catalouge in the industrial paints there are "DTM" --direct to metal paints, and coal tar paints, but it was too much $$ to try for play