Not that I know of, I used it on my old tank that turned out to be worthless anyway and it held up fine way down on the bottom so... It is supposed to be ideal for doing this kind of thing, and it's just about the cheapest thing you can do. My brother just fixed a leak in his tank too with it. Oh, if you're in a hurry and don't have the time to wait for it to dry the whole day or two, you can pay a little more(couple dollars) for JB Quick, and it sets up in a matter of minutes and is ready to be used in probably an hour or two. Just follow the directions and it works as it says.
