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thanks people. overnight with TT off no leaks. so now i know where as suspected.
i am using a product called Premium Construction Adhesive PL. a polyurethane material that is supposed to have a lifetime life and is waterproof. can cure in 24-48 hours.
my pond temps are now 59-60. air temp right now is 50.
i am leaning towards submersion in the pond. i can corral them in the shallow end where there is great flow and i have a bunch of airstones. that way the cold night temps won't affect them and they won't dry out. the downside is i will have to get in the pond to retrieve them early one morning next week.
Carl
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