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Thread: 3M Marine Sealant

  1. #1
    Join Date
    Aug 2002
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    Default 3M Marine Sealant

    What experience, if any, do people have with 3M Marine sealant #101? It claims to be a low strength, sealer, beading compound that is removable. Is it easy to work with, or messy. Is it paintable. How removable is it. If you don't like it, what do you like. Any information on your experience is appriciated.

    George

  2. #2
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    Oct 2000
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    Default Re: 3M Marine Sealant

    It's much like Life-Caulk and the other polysulfide goops.
    In comparison with the urethane caulks like 5200, it's more flexible, much less tough and easier to remove. Not as messy, either. It is paintable.
    Don't use it for Lexan (polycarbonate) windows.

  3. #3
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    Sep 2004
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    Cincinnati,Ohio,USA
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    Smile Re: 3M Marine Sealant

    Much has been said about these "goops". Just do a seach in this forum. But - DO NOT use any of these polys (sulfides & urethanes) in wooden boat plank seams. If you do, your boat (planks) and boat will be greatly damaged. Also, don't use them as a bedding compound. If you want a bedding compound product, use something like Interlux bedding compound.

  4. #4
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    Default Re: 3M Marine Sealant

    Why not use it as a bedding compound? I've been using 101 as bedding for years.

    Pieces remove without herculean effort, no leaks, no complaints on my end.

    It does yellow with age. I haven't tried painting it.
    We must go too far in order to know how far to go. Yeah.

  5. #5
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    Default Re: 3M Marine Sealant

    101 is an excellent bedding compound. Polysulfides in general make excellent bedding. Waterproof, UV resistant, flexible and not too sticky. Too bad 3M stopped making it in black.

  6. #6
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    Default Re: 3M Marine Sealant

    I don't know that polysulfide compounds so much damage deck planking as they are less effective in maintaining a good seal against both edges across time. Some are better than others.

    I agree with Scott that they make really good bedding compounds for the sorts of items you won't be removing during routine maintenance.

  7. #7
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    Default Re: 3M Marine Sealant

    What happened to the 'Thiokol' goo of yore?

  8. #8
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    Default Re: 3M Marine Sealant

    Jim,

    As I understand the chemistry and "branding," polysulfide is thiokol.

  9. #9
    Join Date
    Apr 2007
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    10,097

    Default Re: 3M Marine Sealant

    Works great as an emergency contraceptive too.

  10. #10
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    Default Re: 3M Marine Sealant

    Quote Originally Posted by Scott Rosen View Post
    Jim,

    As I understand the chemistry and "branding," polysulfide is thiokol.
    The bedding compound used in building Pearson boats of the early sixties was a greenish goo that stayed gooey for decades. I recall that it was called Thiokol and I haven't seen anything like it in recent years. Today's polysulfide sealants become a solid. The old stuff stayed gooey.

    Thiokol was also the name of a company that did the pioneering work in polysulfide sealants and later concentrated in solid fuel rockets.

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