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I am looking for a tough finish for the axle/rearend housing? What would be toughest-enamel/urethane/epoxy?

And how would the toughest compare to a powdercoat?



IMO, on scale 1-10, powder coat being 9, 2 part urethane 7.2, epoxy 6.9 (it chalks?) enamel 4.5. Not sure what your concerns are, but you could for a reasonable cost yellow zinc plate the entire housing , and then do any of the above processes, which would almost completey rule out rusting from paint chips, minor scratches, etc. however the paint processes would require a etching or epoxy primer. Not sure how far you want to go with this.

Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.