Can't go wrong with Clayton.

Once powder coating is scratched, compromised or even if it's not applied heavy enough, moisture get under it and simply BLOOMS rust, it's unstopable until sandblasted clean & readdressed with good primer & paint. Most vendors do a chemical wash at best on these large parts prior to coating, but this dosent address mill scale or welding slag.....some vendors don't even prep with a chemical wash, powder coat will cover most anything, even rust...but it will not last. The best prep for powder coat is a fully sandblasted surface so the powder coat can bite into the surface. Ford made the dreadfull mistake of powder coating suspension parts on their trucks, they totally rust and fail. (in areas of salt & calcium)