Bike Forums - Patching near an existing patch, likely to succeed?

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- - Patching near an existing patch, likely to succeed? (https://www.bikeforums.net/bicycle-mechanics/979035-patching-near-existing-patch-likely-succeed.html)

Quote:

Originally Posted by StevePGN10 (Post 17268068)

I dislike sanding. It is too easy to get poor results. Cleaning the tube with alcohol or simple green works so much better. It quickly and completely removes the pen markings and the mold release and leaves a totally black finish that is ready for the vulcanizing fluid. What is really convenient is the alcohol wipes from a pharmacy, they come in a big box for a buck or two. Easy to store on the shop shelf or a in a patch kit.

Well, we keep alcohol swabs around for cleaning rosin off of violin strings, so maybe I'll throw a few in the sag bag and try them on the next puncture.

Looks like simple green is basically a heavy alcohol plus detergent.

Quote:

Originally Posted by StevePGN10 (Post 17268068)

You're not sanding to clean. You're sanding to increase the surface area of the repair, which greatly increases the strength of the bond.