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Old 02-12-2014
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What's the best was to seal my stanchion bases?

Hey guys, I know this sounds like a typical question, but I searched and searched but couldnt really find any answer that really pertained to my issue.
Ok, so I have my stanchions removed and have been faced with the issue of how to seal these buggers up. So, most stanchion bases I've seen, sit completely flat to the deck, with the entire footprint making contact. My bases on the other hand only make contact on the perimeter, as the base is actually hollow with an interior height of a bit less than 1/4". I've considered the typical butyl tape solution, but I only forsee it being cut off by the edge of the base and ultimately having no function. The idea of also just filling the base up with butyl or a sealant has crossed my mind but that seems a little amateur. Ultimately, the answer that seems to make sense is to cut a rubber gasket the size of the base to make the seal, but I've read that many people frown upon that execution. Does anyone have any ideas?? I just wanna get back on the water!
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Re: What's the best was to seal my stanchion bases?

I believe butyl is the way to go. The only thing you have to worry about is water getting into the deck thru the screw holes. Make sure they are chamfered and use lots of butyl.
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Re: What's the best was to seal my stanchion bases?

That's going to take an excessive amount of butyl though, like probably a whole 30 foot roll for the 6 bases. Has anyone here been in this exact situation?
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Re: What's the best was to seal my stanchion bases?

This is not something you want to 'short cut'... You want something that will work well, and not harden over time. I'd say Butyl was the ideal product for this particular job.

Have you seen this from Maine Sail?:

Bedding Deck Hardware With Butyl Tape

He's also the go-to supplier for the proper butyl product.
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Old 02-12-2014
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Re: What's the best was to seal my stanchion bases?

Butyl could be good as it works by compression.

Another option is Dolfinite. It's a semi-paste (I think that's how it's described). You can put it down at the base, tighten the bolts just enough to hold it in place. Then, once it dries, you can tighten more and the compression will help seal it from water. I have some, but haven't used it (yet). I opened the can and the dried layer on top had a rubber feel that could be compressed and was flexible.
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Re: What's the best was to seal my stanchion bases?

I think we're having trouble understanding the mounting surface of your stanchions. Can you give some details on how wide the actual contact surface is? A picture would be very useful, too. VERY useful.
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Re: What's the best was to seal my stanchion bases?

Are the bolts/screws going to pass across the void? If so, maybe try using non-hardening windscreen mastic to fill the voids.
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Re: What's the best was to seal my stanchion bases?

The bases sound like the hollow castingstypically used in chrome-over-zinc rail bases.. I've filled the voids with butyl tape. It really doesn't take that much.. Another product to look into *might* be a butyl caulk used in rubber roofing called "water cut-off mastic". Sticky, nasty,goopy and never dries.. The more presssure the better tthe hold...but it works! Last I bought was $6 per 11 oz tube.fills a lot of stanchion bases! ;_
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Old 02-13-2014
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Re: What's the best was to seal my stanchion bases?

I am also having difficulty understanding what you are trying to accomplish here. Aside from the bolts that mount the bases to the deck, why would you want to seal up the bases? Water will get in to the tubes from above and only fill them without an egress point anyway. That would cause rusting inside the Stantion bases.

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Re: What's the best was to seal my stanchion bases?

I'm not sure I totally understand your setup, but yeah, it sounds like you should be worrying less about the bases and more about whatever goes through the deck--that's where you want your seal. Do screws go through the 4 corners?
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