Originally Posted by al40
unscrew the nozzle and wrap insulating (PVC) tape wround the thread (covering the hole) until you get a good seal. There is sometimes a little that sets but I've had a tube like this since Oct last year and it's still OK.
I'm impressed - I've tried similar tricks but never succeeded without the hole in the other end approach. I think I recall reading some tech guff that once it's exposed to air it has a reaction - ie it's curing rather than just drying out.
I'm sure they didn't formulate it like that to keep you buying new tubes of the stuff . . .