You might want to read the customer reviews that are published with this listing before buying this product. Not too encouraging!
Meyer I would never recomend a product if I hadn't used it first.
Secondly if it didnt do the job, which it does, our pond should now be leaking .
The bottom drain of our pond was first sealed by using gold, then the bottom drain was further secured with stainless steal screws .
Also our return pipe which is 2fy bellow the surface of the water level was also sealed with gold , then it was further secured with stainless stal screws.
Lastly the former return pipe now overflow/skimmer was also sealed with gold, then further secured with stainless steal screws were added.
These seals hold back 1,000 gallons imperial of water with no leaks in over 6 years now so I would say it works wouldnt you ?
When I ran the Koi Keeper Unleashed website before Carl its owner fell foul of the world wide resession I answered a number of threads about this product and nines out of ten it was proven the poster had not properly followed instructions when applying the product .
Going through all the reviews there are those who didnt have a problem and those that did , I'd say that the number of bad reviews were down to those who didnt uses it properly.
If you look to the right of the page there are older reviews and the number of 5 star reviews far out weighed the bad ones .
Dave