Erik, Soryy about your board. I would be very leary of the glue you are talking about. I'm not familiar with it and it might work, but it also might create a worse problem than what you already have.
Some chemicals actually cause the glass and foam to melt away.
I can recommend 2 things, Ding Stick and Marine Tex. Both are two part epoxy's, but Ding Stick is a putty like substance that you mix in your hands like play doh and the other is two separate substances which you mix together and apply. Both will seal the board and are safe for the board. We use them ourselves for minor repairs. If you don't have Ding Stick in your sail bag, you should just for situations like we are talking about.