Originally Posted by
billydonn
I have found the scuffing step very hard to accomplish with the narrow tube flexing around etc. Even getting the little rib sanded off the tube seems nigh on to impossible to me. The glue on patches seem to work okay without that step so I have mostly given up on it. If there is a trick to successful scuffing anyone please tell me the secret.
I don't worry about sanding off the rib. You just need to rough it up a little. Smooth surfaces don't bond as well as irregular ones. If the tube won't hold enough air to keep the surface firm, I lay it across something firm, sometimes my knee.