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For steel parts some type of iron phosphate coating is the norm. If the parts have expanded metal on them, the grit blasting will beak down some of the sharp edge and that's probably as good as it's going to get. If you can DA sand any of the other edges without being a major hassle, that's...

Hello. I had a powder coating business for about 9 years. If any of your parts have sharp corners you should de-burr them as the powder will have a very thin coverage on sharp edges and rust will start in time. Also, are they pretreating after grit blasting? Most places that grit blast will...