Senior Moment Member
Join Date: Jun 2011
Location: West Vancouver B.C.
Thanked 118 Times in 113 Posts
Rep Power: 6
Re: Sealing Keel Bolt Washers and Nuts
After some more looking on the internet I think I'm going to use the polysulfide (like Boatlife). The polyurethanes(4200/5200) are far more permanent than the polysulfides. I plan on resealing the keel bolt nuts and washer each year and I want to be able to remove them without a big effort. I just finished reworking my keel stub on my Catalina 27 and want to be able to keep, as much as possible, water from getting into and around the bolt threads.
The low adhesive variants of polyurethanes like 4200 and SikaFlex 291 are NOT as permanent as polysulfide, trust me. Polysulfides must be treated as permanent when you use them. I speak from experience that hammers and chisels (or explosives) are the only things that will remove pieces bedded with them. I have never once removed a piece bedded in polysulfide that didn't cause serious damage to either the piece, the substrate or both.
I, myself, personally intend to continue being outspoken and opinionated, intolerant of all fanatics, fools and ignoramuses, deeply suspicious of all those who have "found the answer" and on my bad days, downright rude.