Preparing aluminum parts for enhanced cosmetic appearance
For aluminum prepping--especially during restorations or engine re-build--prefer the use of glass beads for bead blasting vs sand blasting as the process with glass beads seems less aggressive--having used same for years on Coupe, Bavaria, and 2002 parts.
Maintaining same over the years is not too difficult in our climate. Michael P. put his finger on good upkeep practices with fine steel wool although I also prefer fine or medium bronze wool along with mineral spirits if there are oily surfaces--as then you don't have rusty particles blooming after freshening.
Must admit--I'm no longer envious of not having four seasons of hot, not so hot, wet, cold, freezing, snow and ice--survived that for about 36 years--and the hot, high humidity summers admittedly create a greater challenge to Coupe ownership and upkeep than our mild, dry (usually) climate we enjoy here in SoCal. (;>)