I'm interested in a product to seal a leak in my waders. These were purchased quite a few years ago but still are very usable and in good shape with the exception of one boot is beginning to leak where the nylon meets the rubber. Any recommendation

We recommend Aqua Seal for wader repair. You can view it here: https://www.llbean.com/llb/shop/59414.

Shoe goo is a product I think you are looking for, if LL Bean doesn't cover it.

Call the store. They have a service to fix duck boots. I used them. It was a small cost for boots that I like

Call their customer support line and explain the situation.