I have a method that Works Without a flaw.
Drain the tank completely, Then let it sit with the cap off for maybe 3 hours to a day, then using a heat gun, Carefully begin heating the area in a 1" circle around the crack.. Let the tank get soft enough to Just melt but not get drippy, Then Remove all heat and Let the tank cool overnight.
And Voila! Perfectly good!
The Science behind this is the Plastic melts and then fuses back together again, As if you re-molded the tank... This Will never come apart again.
Kori
