I dont know if this will work (not tried) but maybe just some of that white masking tape over the pu,then use spray on aircraft paint stripper and just wipe way the paint.
sorry for the major ass bump but could you just get some oven cleaner and rub off the anodize finish with a rag or something? i really want to do this with my eagle
I used oven cleaner and a scotch brite pad on metal cores that were red and it didnt come out like a clean raw color it was wierd. It was like pinkish dirty raw after.. Youre better off just painting your cores silver