terrymorse 

I've used those stick-on Park boots before, but I've also had them fail pretty quickly.

They don't hold the tire gash closed very tightly, so if the hole is on a part of the tire that touches the road, the boot wears through in several miles.

I like my ballistic nylon/super glue patch better, as it holds the gash securely closed. I've ridden a few hundred miles on a tire patched in this manner.

Gorilla tape might work just as well. It's strong, not stretchy, and very sticky. But how to carry it in your saddle bag?