What can I use 2 seal the remaining room n a grommet for a car amp power wire to prevent water leaking through

Question

Im using a 4 gauge car amp power wire that will be going through a firewall using a 1/2 hole size rubber grommet that leads to the car battery. The grommet still has room for water to leak through after I route the wire through. What material can I use to seal the remaining room so I wont have leakage in the interior of the car? Thanks

Answer 1

RTV Silicone

Answer 2

If you look hard enough for car audio supplies, they actually make special grommets to do just what you're trying to do. It will be a little harder to use that silocone but it's worth it quality wise, and it looks better too. Siliocone will work, but it's also likely to fail in a little while. I would call it more of a temporary fix. Here are a few places just for starters:

http://www.avtoybox.com/car-stereo---vid...

http://www.wildwestelectronics.net/mpc-p...

Answer 3

There's a product we installers use called dumdum, or strip caulk.