It's impossible for that to be road grime. The kit is brand new. This was the 3rd time those parts had been coated. They held the parts in chemical stripping tanks to strip the coatings. What was inside was either chemical stripper or the metal cleaner they used after. Whatever it was burned your skin when you touched it. It was definitely a stripping or cleaning chemical. It's now flaking off on the edges where they were laser cut. I asked them for a full refund since now I've found that the coating didn't even seem to adhere properly. They refused so I told them I'd gladly share my experience with their company.
Save yourself the headache and don't even consider using PowderTech in Wichita.