[Three Peaks]

You might want to try that Slime stuff as a short term solution to seal up the wheel. I probably won't last for a real long time, though. For a more permanent solution I would think you could have the tire dismounted from the rim and apply a coat of epoxy to the inside of the wheel. One good way to make sure it will seal completely is to heat the wheel with a heat gun or hair dryer until it is almost too warm to handle with your bare hands, then apply the epoxy until it won't take any more. This will force the epoxy to thin out and be drawn into the pores of the aluminum and seal them. Once it dries for the recommended time, recoat with 2 or 3 coats of the epoxy and it should be pretty permanent.

Of course, the best idea is to contact Trigo and see if they will replace the wheel. Sounds like a warranty issue to me.