Two very similar products: "Shoe Goo" and "Amazing Goop." I don't know the difference, except that the latter comes in a larger quantity for less money. I've repaired small dings in saddles with it. Worth trying on a non-functional portion of the saddle before attempting to repair the crack. Meanwhile, I'm going to check out that waterproof electrical tape. Maybe it has something special for sticking to vinyl, since a lot of wiring insulation is vinyl.