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 Underwater sealant		  New Topic  Topic Locked
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OJ
Master Marine Consultant

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USA
4382 Posts
Initially Posted - 03/04/2002 :  15:11:05  Show Profile
Not that I can think of a reason why I would ever want to remove my soon-to-be-installed bronze thru-hulls, but I'll stay away from the polyurethanes just the same. Polysulfide sealant seems to be the correct choice here? Finger tighten thru-hull by hand until the sealant cures, then make snug with a wrench while not squeezing out the sealant.
Comments, suggestions, hindsights . . .

Steve Madsen
#2428
OJ(Ode to Joy)

[url="http://catalina25-250.org/photo0.htm/"]<img src="http://www.catalina25-250.org/photo/ode075.jpg" border=0>[/url]
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Response Posted - 03/04/2002 :  16:44:56  Show Profile
I believe polysulfides actually cure better when wetted. Somebody please correct me if I'm wrong.
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John Mason
Admiral

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USA
687 Posts
Response Posted - 03/05/2002 :  18:21:58  Show Profile
Yes, they cure as a reaction to moisture in the air. Higher humidity (higher temp.), faster cure. But apply them to dry surfaces. Also understand that they can take up to 7-10 days to fully cure.

FROM PRACTICAL SAILOR--------------------------------------------
The polysulfides cure slowly compared with other marine adhesive sealants, with the one-part formulations generally taking significantly longer than the two-part compounds. Although the compound should be applied to a dry surface, polysulfides will continue to cure underwater, and boats can be launched with mechanically fastened fittings bedded in partially cured material. In an emergency, polysulfides can even be applied underwater, but this should be considered a temporary fix rather than a permanent solution.
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John Mason - Ali Paroosa
1982 - FK/SR #3290
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.