Sealant on window regulator

[bikewiz]

What is the grey pliable sealant on the window regulator where it mounts to the inner door?
I have some elastomeric marine sealant that would probably work, but what was usually used?

[94touring]

I'm not entirely sure what it is either but I believe it's like "fingertip rope caulk". 

[bikewiz]

I'm not entirely sure what it is either but I believe it's like "fingertip rope caulk". 

Yes it does look like that. Cool Thanks.

[MiniDave]

Butyl rubber, sticky stuff and takes a long time to cure out!

[skmini]

aka Butyl Seal Tape.