powdercoating the front rod could be a problem with the firewall bushing... that thing is tight as hell as it is...
you also couldn't coat the ends of the rods I don't think... too tight a fit...
if you just want to coat the main shaft part, of the rear rod, that will be fine, I would think... but not very effective to only coat about ~1/3 the total linkage...
seriously, I thought about this before I did mine, and now I'm glad I decided not too... things are hard enough to fit together as is....