I did my wheels myself, they were in a ***** state with bare metal being exposed, i used nitromorse to strip all the paint off and take it down to bare metal, simply used a wire wheel on a drill to help with taking it off, once down to bear metal, rubbed them down and then used an etch primer before using a normal primer, the etch primer sticks to the alloy and allows the primer to stick to that.
It took me a while to build the layers of primer up, with rubbing them down each time.
i painted mine with a spray gun not a rattle can and was really pleased with the finish, considering my standard wheels are now my winter wheels grown quite attached to them!!!