I have kept an opened squeeze tube it in the freezer for several months. When I needed to use it I put it out in the sun for a while and it worked fine. Each time squeezed the air out, and took off the pointed spout and screwed the cap on.
I read about doing it on one of the forums years ago.
Steve W
-- Edited by Steve on Sunday 28th of November 2010 05:02:01 PM
A technique we use with fair success with caulk that is in a caulking gun tube is to cut the finger off a latex glove (surgical glove) and tape the open end down around the nozzle on the tube with electrical tape. Then fill the fingertip with caulk (sort of like a water balloon). The caulk in the fingertip will harden but between it and the latex glove "balloon" no air can get down into the tube. Caulk lasts quite a long time when we do this--- six months, maybe? I've never kept track of it.