I replaced a hose faucet on an exterior wall of my house. In order to do so, we removed the old faucet and had to scrape out some gray goop that was sealing the hole between the wall and the pipe. Now we have the new faucet and pipe and need to know what to put in the gap where the dark gray sealant was. It seemed kind of like caulk.
The wall is made of wood, with a vinyl siding on the outside. I live in a cold climate, the previous pipe had to be replaced because it was leaking, probably due to improper winterizing.