Stripping Motor Anodizing Off

[Serum]

it took me 3-4 minutes, i've got a rather powerfull dril, nothing fancy though.. A hitachi, i thought it does 2850 rpm's

I did 4 feigao's like this. The first was the worst.. (like usual) i took of too much, underneath the purple layer is another hard layer (looks dark gray when sanding) you'r better of if you leave that one on... It's easy to polish as well. I used the brown scotch brite.

I will make a movie of how i do it.. I don't know what i do different.. Perhaps you took of the 2d layer as well Joe?
A 20XL wil be harder than a 7XL (lower internal resistance keeps the rotor better in place...)