need help sealing a pond

[carpediem]

What can you use to seal a pond (part rock, part concrete) with an uneven surface. A liner would be extremely hard to install. Are there any liquids available that stretch slightly when cured to allow for seasonal temperature related expansion and contractions?

 

[krap101]

i think theres some sort of spray and i think there might be a paint type thing. like polyurethane or something?

theres also something called well diggers mud. its like a powder that watertights stuff like wells. ive heard of people using this on their ponds. the real name for this is sodium bentonite

 

[ddm_aet]

how about trying fiberglass two part system comes in sheets of a fiber material then you use a resin with a harding agent and trowel or paint it on to the fiber sheets, i'm currently working on a inground fiberglass pond just in the designing stage right now

 

[BillD]

There are cement based coatings available to seal basements that should work for waht you are trying to do. I don't have a brand name since I last used it 20 years ago. It is basically painted on using a very coarse brush. It comes in various colours, and requires a couple of coats, but it worked very well when I used it. It should work even better, in your case as you are trying to keep water in, whereas, I was trying to keep it out. Check the building stores. The stuff I used was a cement powder, that you mixed with water. Basically, it was similar to parging.

 

[carpediem]

I am just worried about the water quality afterwards. Afterall, I do want plants and fish to be able to survive in the sealed pond.