I have something strange …
I ve already polished a few parts with great success .
Now I m polishing parts for a car . The parts from external suppliers ( carb , fuel pump , ignition , etc ) are great .
All the parts specific to the car brand ( AMC ) have the same problem : white dots between 1 and 3 mm wide .
I ve sanded with die grinder and Scotch Brite , then 220 , 400 , etc up to 2000 , like usual .
Before buffing it looks nice .
I ve tried using only Rouge , with different speed , I always have the same problem .
I suppose the cast is not perfect from the factory , or am I missing something ?
Exemple : ( not perfect yet , but you have the idea )