J-B溶接ブラック　RTVシーラント – 3オンス 3オンス 31310

As a silicone sealant it does an adequate job, and the tube style makes convenient for home repair use. I was able to patch up a small pipe leak with it, among some other repairs. It isn't particularly easy to spread smoothly, however, and tends to clump up. Curing time is reasonable.The included application spout is not very useful. It takes a bit of effort to get it working, and then it ends up full of solid silicone that needs to be removed before it can be used again. Very inconvenient and wasteful of product.The stuff has has a very strong acrid, vinegary smell to it, until it cures. You should probably be careful to keep adequate ventilation when using it. Wear disposable gloves, too, if you can, although that can make application even more awkward.I didn't notice when I ordered it that it had to come all the way from the UK, so delivery time was long. I would probably have searched harder for a more local choice if I had.