a couple days ago, i cracked my old base while loading up some ice into it. i guess it was "shock". the crack wasn't bad, but it did leak enough to be quite troubling. since it was already broke, i figured i'd try anything to fix it, so i tried some stuff called "mighty putty". it's a epoxy based putty that seals almost anything. i was VERY skeptical of it, but my brother used it before to fix some stuff around his apartment.
needless to say, i was pleasantly surprised and it sealed the leak perfectly. so, anyone that needs to repair a cracked base, give this stuff a shot.