Lastchance, some may laugh but......LOL....I repaired an older pair of Orvis boots three years ago using Gorilla Glue after the soles started coming off. Took off the bad soles, cleaned the boot carefully, put the glue on both the old sole and the boot and then wrapped in masking tape. These boots are still going strong. BTW, took them to a cobbler shop and I was asssured that Gorilla Glue would not hold up. And these boots get a lot of hard use. Good luck whatever you try and am sure other products will work well also.
Crackleback