Originally Posted by
a77impala
Scabs let me down again! Had a flat so put tube in I had repaired at home with Scab patch. Pumped up with my Road Pro and took off, flat within a quarter mile. Took tire apart, patched tube that was in tire reassembled and rode off, flat within quarter mile. Took tire off, patch leaked, peeled off patch, put on new one, took off, flat within half mile!
Without knowing anything else, I suspect you're not sanding off the mold release compound on the surface of the tube. That stuff is formulated so nothing will stick to the tube's surface during manufacture. If you try to patch the tube later with it still on the surface, guess what? Nothing will still stick to the surface!