Reflo Dart Seal

[molotov]

So I'm in the process of replacing the seals in my reflo dart. Step two of the instructions say to apply sealant to the bracket bore ID wall and around the seal case using a non-hardening Silicon material. NEVER USE PETROLEUM SEALANT.

My question is, what kind of non-hardening Silicon material should I use?

http://www.melevsreef.com/dart_seals.html

Thanks