Freesole is the best boot cement for sealing seams, patching boots, repairing delaminated soles, etc. for both leather and rubber. It cures, remaining flexible, and does not harden the same way Shoo Goo does. It will last longer.
Tuff toe is an excellent product for coating the toes and other parts of boots where friction, caulks points and chafing can damage the leather. It is also good for protecting seams from wear.
This might be a good time to remind people to consider reading through the WSCA's Footing Report. Here's a link: