If I were you, I'd just get the frame media blasted. It will only be around £30-40, and will save you an awful lot of hassle, and give a much better key for the paint to stick to.
Seconded.
@general_greyharbour started
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If I were you, I'd just get the frame media blasted. It will only be around £30-40, and will save you an awful lot of hassle, and give a much better key for the paint to stick to.