bikerbond

Hi This is a standard problem as the wiper arms are an alloy mix metal not to be confused with aluminium) just a mix of poor alloys You cannot powder coat without removing the hinge pin, these cannot be bought !!! So best option is good wire brush and then sanding with wheels in a drill or similar. then a good quality acid etch primer followed by a satin black top coat ( hamerite or similar) Any decent car paint mixing shop should be able to provide the acid etch primer and satin black aerosol type cans for about £15 t £20 a can The etch primer is excellent s a general primer on all bare metals so is worth getting a tin and keeping it! and the satin black is just useful for all kinds of brackets etc