While were on these random pond sealing ideas, seriously how about saw dust? I have a big lumber yard down the road and I could probably get as much of it as I want for free. How to haul it would be the question. I thought about covering the banks with it and then adding 6 gallons of the sticky DB-100 to bond it and seal it?? Just an idea...we had another 1.5 inch rain last night and my pond is way up but i'm sure will slowly seep back down to it's current sealed off level quickly. I currently also have about about 50% of the pond covered in leaves that fell during the wind yesterday that should help seal it too maybe?? I'm sure it wont help my organic load but we'll worry about that next year!