Bike Forums - View Single Post - '72 Schwinn Sports Tourer rebuild ques: rims
Old 01-05-19, 09:27 PM
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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.
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