"Nope. I've been riding for more than 30 years. I've never had a bad tube out-of-the box."



k



...for you.



A used tube that has worn spots, abrasions, oxidized spots, I agree, not worth the risk.



However, new out of box: misdrilled stems (off center, hence leak at thread valley, where break will occur...), three of those so far; cracky crinkly spot, no good, dustbin, four of those; tears at seam, three; bad valve, two.



Hence the spare tube in my little seat pack is usually a proven tube; if new, it's been inspected.



I genrally toss road tubes after five patches, depending, mountain tubes at seven.



NEVER had a patch fail.



I have, however, mispatched a tube, then either repatched or dustbined the tube.



Heh, I've never put a bad patch on the bike then had it fail, jeezes, and hope I never do.



There's nothing particularly special about the Rema glue, except it comes in a small tube, easily carried with.



At home, use Pax



http://www.bikeworldusa.us/Pax-Rubbe...source=froogle



Whatever the product, squeeze out any air, don't puncture the container or break the cap, and be sure the nozzle shoulder has just enough of a film to seal.



Unless there's a problem, or many open/close cycles, a small tube of patch glue should be usable until all gone.



That is all.