I use Captain Tolle's sealant. (https://defender.com/en_us/captain-t...hoCzFgQAvD_BwE)
It doesn't claim to be a glue, but I use it as one and it works pretty well.

The stuff I have is getting pretty old and I should replace it. The Captain has gotten pretty expensive and maybe I should be using one that claims to be glue. Yeah, CA, but I don't like CA.

Is there a thin glue out there?