[Waorani]

Like any coating, good prep is the key. There needs to be a good grippy surface to apply the powder to. Most of my stuff was smaller and blasted w/ aluminum oxide in blast cabinet. Everything I did 15-20 yrs ago still looks like the day it was coated. I have a cheap electric oven I use in the shop for various projects but no way would I pay $1k for bigger oven unless I was going to do it commercially. Easy enough to build an oven yourself.

Assume you mean Model A wheels? Not sure on those but I had five '58 Buick wheels done about a year ago - $100ea.

One thing to watch out for with DIY powder coating is "Faraday cage" effect where corners/nooks/crannies get a weird charge and actually repel powder. That might be an issue with all the spokes on a Model A wheel.