Chuck wrote in :

Has anyone used the Flex-seal product I have seen advertised on TV? If
so, is it any good? I have some leaky ducts and they show it works for
that.


"As Seen on TV" is a warning label.

Off the cuff thought and never actually tried it but line the trough
with Vycor. Continuous rolls in various widths and it's sticky sticky.
Only problem I can think of it's not meant to be constantly exposed to
UV.

http://www.na.graceconstruction.com/...24_Guide-B.pdf