Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
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You don't want to do anything to remove the pitting. Since you can't add metal back, all sandblasting or any other method of lowering the metal to the depth of the pits would only further weaken the tubes.
If you're painting, the primer coat will fill the pits, though you might need 2 coats to do a better job.
Shotpeening - like sandblasting, but with steel balls - will help blend out the edges of and serious pitting without removing more metal. In fact shotpeening tends to strengthen the tube by easing some latent stress risers. I doubt it's worthwhile for your purposes unless the rusted area is deep and extensive.
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