Just like with aquaseal and some other glues, the remaining 3M in the tube is supposed to harden fairly soon after you have opened the container. I've had good results for over a year or more storing such small half-used tubes in the freezer. I just put them in warm water and massage them to warm-up next time I need to use them. Then stick back in the freezer. I guess a gun-tube is not something you can massage like a toothpaste tube, so it will take longer to warmup for the next use. Seems to be working fine this way...
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