I keep "glue-less" patches and a spare tube on all my bikes. However, as mentioned, these are less effective than patches that use a vulcanizing glue. So, if I have to patch a tube while on the road, I use a glue-less one and then change out for a glued patch when I get home. And, yes, I've had to open a new tube of glue when the one I used before had dried up.