A mundane topic....but it bugs me.  How to correctly paint "Satin Black" onto door handles, so that they last.  Anybody do this?  I have failed on numerous attempts.  I think it was because I was impatient.  I "think" the proper procedure would be to sand down to mostly bare metal.  Clean with acetone.  Light spray of self-etching primer.  Bake in 250 °F kitchen oven?  Lightly sand....then second coat...and second bake.  Another light sanding.  Then, a light coat of quality Satin Black rattle can; followed 20 minutes later by another coat of Satin Black rattle can.  Bake again in oven, maybe for a few hours.  Handles would be propped up appropriately on piece of wood.  No...I don't want to go the powder coat way....too costly and worried about messing up internal lock mechanisms and cooking old lubricants.  Any tips?  I have tried to shortcut the procedure, only to have to do over.