never tried it for that, but i have used the liquid to seal a leaky valley on a roof. (so far so good.)
the tape i used around some roof vents,think really sticky, thick duct tape.
the spray? I wouldn't.
1. it will take time for it to fully cure.
2. if it isn't fully cured and you put the carpet back in, that carpet will never come out again.
3. there has got to be a cheaper solution.