is a regular poster here, that's where I got my last batch. I use it for just about any on-deck type bedding.
http://www.pbase.com/mainecruising/butyl_tape
And if I wanted to use caulk type bedding, it would not be 4200, but rather SikaFlex 291. I love that stuff. And, no offense to Don, but I would bed it (just ntil you see splooge) and forget it, not tighten it down after cure.
Cheers, John