While the way Rainman describes is the best way I have seen what you are suggesting work. See this this thread :

Here are a number of links to prior discussions on bentonite and methods to stop pond leaks. Several note the use of drilling mud in various methods. See the first link for our successful use of drilling mud.

http://www.pondboss.com/forums/ubbthread...h=true#Post3936

Last edited by ewest; 09/05/10 08:32 PM.