I checked out the Sodhopper website a while back and decided to get some tire crumbs and make my own sole goop. I used contact cement, which seems to be real similar to barge cement. I just mixed it to a thick paste consistency and applied it with a butter knife as he suggests on the website. It really seemed to work pretty well, but the moccasins I tried it on were not very good quality and I was not able to wear them for very long. So I can't vouch for long term durability.
I am planning to get a pair of Arrow moccasins and try the tire crumb sole on them. They are well built and should hold up to some rough wear. The nice thing about the tire crumb sole is that you can just replace it when it gets worn.
In my research it appeared that all of the "Goop" products, Barge cement and contact cement are very similar in their chemical make-up. The most important feature in common is the flexibility after curing.