Again, I'm not a fan of powder on race car parts.

I wouldn't use it on engine parts. I paint iron blocks, for appearance and rust concerns, but I don't go crazy with it.

For everything else, you spend the time to make stuff fit nice, keep your tolerances tight, fasteners fit the holes, rod ends fit in brackets, assemblies fit mounts. Then put a thick coating of powder on stuff and nothing fits, So you grind, drill, ream, etc., to fix grounds, fits, tight holes, etc. It's OK for some things, but most of this stuff I prefer paint or nothing.