90 Gallon leaking..

[Navigator]

Well. The saga of my 90 gallon set up continues. I finally (!) got the stand fixed as the base on it was a bit warped and heavily shimmed to level, so I replaced it - the base was level and the tank was level and the world was a great place until I got all the water in the tank. It leaks. It doesn’t leak when it’s half full, like it has been for about a month, holding my 60 lbs of live rock (half dry, half premium) but as soon as I filled it to the top, the next day I had salt creep up the front right corner that was about 8 inches wide and 4 inches high.

Is it worth trying to re-seal a tank of this size or will the pressure of the salt water just blow it out again? Anything I've seen on DIY indicates you can really only re-seal smaller tanks but I'm not sure if that is true. If I do get it resealed, can I DIY, or should it be taken to a professional – or should I just wait for Big Al’s Boxing Day Sale, or a fellow CanReefer sale? I’m just a smidgen frustrated.