Firewall "Sealer"
 

What have you guys used to replicate this? I made sure to leave the original sealer on my firewall during the restoration, however, I want to apply the sealer to the two e-brake mechanism nuts as well as the wiper motor. What's available? I'm looking at an undercoating product from Eastwood, but I don't think that'll give me the same look.

I have used black seal sealer that comes in a roll. Round with a 5/16 " diameter. I use it for trunk bumper brackets and eBrake nuts and windshield nozzles.