Transmission case is polished by Waterproof sandpaper and Metal polish.
This is the recommendation custom even a beginner can process easily.
The order which will be polished by Waterproof sandpaper is 600-800-1000-1200-1500-2000.
No. 800 of No. 600 influences the result polished carefully.
Finish is carefully in Metal polish
When not maintaining by abrasive metallically after the body attachment, gloss disappears.
But there is a drive system cover in the low location, so maintenance will be troublesome work.
Such cases, Maintains long term gloss if you applied the topcoat.
I’ll have the lead for a rival by such original processing.