Sugru is kind of pricey, but I've yet to find any other adhesive material with the same properties. I've repaired winter shoes, cables, headphones and more with it. It's super easy to work with. I almost wish I could buy smaller quantities economically, because after I repair the one or two things I buy it for, it usually sits unused too long and expires by the time I actually need it again.

Definitely a niche product, but a niche that isn't filled by anything else.