Amazon: Rema patches: https://www.amazon.com/Rema-F0-P-16m...a+patches+bulk

and: https://www.amazon.com/Rema-F0-P-16m...a+patches+bulk

Enough for 6-10 years, never go bad. For glue I have been using tire patch glue from Walmart, about $6 for 8 0z, lasts 4-6 yrs. Though not specifically "cold vulcanizing" I have been unable to pull patches off that have been glued down with this stuff. Victor 00599V

I used to use Weldwood type contact cement back in the '70s to put tubulars on rims, they held pretty well with extremely rare roll-offs but with a flat were not
hard to get the tire off the rim and putting a spare on, there was enough residual tack to get you home. Came in quart cans.

The little tubes in patch kits are one use, ie once the seal is punctured, they go bad in a few months. They also seem to go bad over several years even sealed.