Mike,
No rust inhibition needed in the powder coating realm is a valid statement as far as it goes. One thing to be aware of is that not all powder coaters are created equal and poor surface prep and cleanliness can kill a powder job very easily.
I'm not telling you this 'cause I'm the Zero rust guy. I'm telling you this 'cause a friend had a batch of steel carts go gunny bag on his customers in about a year due to the powder coating falling off in sheets.
I did have one powder coater here in OR use ZR to repair poor (read thin) powder applications when they happened, so as great as powder coating may seem, there still has to be enough film build to seal the steel just like there has to be enough ZR or anything else to do the job.
Good surface prep and enough film build you should be really happy with powder coating......
