Eastwood’s Deluxe Polishing KIt 50341

The brown compund …
The brown compund is removed from the surface using our Pre cleaner or lacquer thinner. The compounds you should be using on aluminum are the brown (Tripoli) as the fist step and then the white (White Rouge) as the final coloring step

Why would you sand …
Why would you sand a machined aluminum piece before polishing or buffing? The Tripoli compound and spiral wheel levels the surface very nicely. Buffing can be done with motors turning as slow as 1800rpm, in fact they reduce the frictional heat conduction into the part. I assume you were referring to the cast iron water neck when you stated “need to sand before” and that is true but I wanted to show what a little effort will produce. Our instruction book describes the leveling or “sanding” steps