Hi there, Has anyone been successful getting a secure seal plumbing through 17 mil pond liner? We bought a billboard tarp (unused) and dug a trench underground to plumb the pond gravity feed to our new high tunnel hoop house. but the fitting leaks and we have no expertise in types of glue or methods. Can anyone with this type of experience help us? I hate to toss this liner and go with EPDM. Than…