Join Date: Apr 2006
Thanked 176 Times in 173 Posts
Rep Power: 12
DrB, the best advice I've probably ever seen is to use bedding compound, as you suggest, but to also use o-rings in order to ensure it cures to a certain thickness--and then go back a second time to torque it down. That's a lot of work, compared to just using neoprene gaskets. After all, even engine cylinder walls are held with gaskets, the trick is the proper installation of them.
Plastic isn't all the same stuff you know. Delrin and UHDPE can be extremely strong in compression. Perhaps more so than the decking they are bolted to. They've been used for mast steps eithout any problem, and very little else on a boat gets that much squeeze on it.