What is the best product or method for repairing a hole in the sole of a pair of rubber garden shoes?

You can buy spare soles, usually sold in packs of 2 at any shoe repair shop or sometimes shoe shops.

These you simple cut to shape and stick over the old sole, wait for it to dry and it's good as new again'

Shoe goo has worked well for me. Shoe GOO How To 050307 (http://www.eclecticproducts.com/SHOEGOODirections.htm)