Old 01-05-19, 09:27 PM
  #6  
dddd
Ride, Wrench, Swap, Race
 
dddd's Avatar
 
Join Date: Jan 2010
Location: Northern California
Posts: 8,562

Bikes: Cheltenham-Pedersen racer, Boulder F/S Paris-Roubaix, Varsity racer, '52 Christophe, '62 Continental, '92 Merckx, '75 Limongi, '76 Presto, '72 Gitane SC, '71 Schwinn SS, etc.

Mentioned: 125 Post(s)
Tagged: 0 Thread(s)
Quoted: 1287 Post(s)
Liked 822 Times in 583 Posts
Often even a very dull aluminum surface is actually well-polished underneath but a very thin layer of easily-dissolved aluminum oxide.

So be careful not to start by scratching the hidden, very fine surface(!), as it takes a ton of work to remove scratches.

Start by testing a small section using a liberal amount of Blue Magic, SimiChrome or similar highly-effective product, and then you will know for sure how to proceed.
dddd is offline