Its the glue its the glue its the glue.... Rema has about the best cold vulcanizing glue (so does Tractor Supplys Cats Paw or Monkey) but once you open the tube its all over... This is in-part a problem imposed by EPA regulations of Toluene... Because of high temperatures 90-100+ this is how I do it in Texas...

I buy cheap $1.50 patch kits knowing that once I open the glue its no good in two weeks - I keep an unopened patch kit in my bag for road use - After roughing out the surface I now clean the tube of with alcohol swabs or even patch glue then I put the glue on the tube and also the patch and let them sit till I can't stand it anymore - After a patch is put on I will wait a week before pumping up - If I have to use the tube immediately then I pump it up once in the tire and not before - Hope this helps...

PVC Cement for pipes works about three months, Superglue works about 5 days, Rubber cement 4 hours, Reagent grade Toluene after a Cyclohexane wash melts the two together leaving a weak spot on the tube, 3M Yellow Vinyl Gasket adhesive works permanently but turns hard...

The 3M glue needs further testing - I think that the 3M glue might just work all by itself???