I've used this glue to adhere vinyl to steel in an underwater environment, vinyl to vinyl for a convertible top requiring a flexible bond, and numerous other situations. It has worked perfectly for the first situation, and has had minor issues with the "convertible top" repair, but has [largely] worked great. Adhering vinyl to sanded, clean, dry steel for a moisture barrier is a perfect use-case for this glue (used on evaporative coolers). UV radiation and heat seems to be its biggest enemy.For the convertible top I used this to glue a vinyl patch to the vinyl top and, while it worked well for a while, ended up starting to fail after about a year. The top didn't leak, nor did the patch separate, but much of the visible glue began to yellow, crack, and even flake off. I assume this had to do with the exposure to UV and the elements. While it did still seal, I'm not sure for how long the glue would have remained flexible enough to seal. The cracking/flaking is due to the glue becoming more stiff over time or with exposure, and would have eventually caused it to fail. Still, only one glue (HH-66) out of about 8 performed better than this one in terms of flexibility and grip, however, this variation of Gorilla Glue came close enough in performance while at a fraction of the price, leading me to repair my car with it not once, but twice, and not regret doing so.Grip = phenomenalFlexibility = Great, until agedClarity = OK, until agedDurability = On a convertible top? It's OK. Elsewhere? Fantastic.This stuff is worth a few extra $ if you need clear, flexible, AND strong.