Originally Posted by Andy_K

I'd put a tube patch on the inside of the tire and ride it. Worst case, you'll find that it flats and you end up replacing it anyway. Best case, the tire keeps rolling.

I tried Shoe Goo to repair a tire with a gash like that once. It didn't actually give me problems in around 1000 miles of post-repair use, but it was ugly -- like having a wart on the tire.