Hi all, Would this work behind a plastic UWL Niche?
V.High water table behind this pool........

Injecting a leak around the niche is a great way to seal it up forever, I have done this on many Gunite pools. Most Gunite pools have a stainless niche and can withstand the preasure of the foam while its expanding. I would closley monitor the injection so as to be sure the niche is not compromised.

Thanks for that SW..........Not thinking of taking a vacation in the UK perchance!!!