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How can I strip the paint from a bike frame? I tried using a sander and it left really annoying scratch marks on the frame.

Is it possible to use a chemical paint stripper to completely remove the paint from the frame?

I do not plan to repaint it after stripping the paint.

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Note that a lot depends on the quality of the paint. A high-quality factory paint job may be "baked" and essentially impervious to chemical strippers. And, of course, you should never attempt any sort of paint removal on a carbon frame. – Daniel R Hicks Mar 6 '14 at 22:28
Careful with sanding, as it probably is lead based paint. I contacted Fuji one time and they stated "The common practice then (and even now) is to use lead based paint." – Carson Reinke Mar 7 '14 at 17:33
up vote 4 down vote accepted

John Allen has a page on refinishing a bicycle on Sheldon Brown's website. You need some covering on the frame to protect it, though. For aluminum, it is recommended to use chemicals and not sandpaper (due to particle embedding), but for steel, sandblasting is fine. The main issue with chemicals is fumes.

There are also several related threads on bicycles.SE such as this one and this one.

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