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I “discovered” a new sealant - polyether

Discussion in 'Cruising Sailors' started by Captain Larry-DH, Jun 18, 2019. Add this thread to a FAQ

  1. Captain Larry-DH

    Captain Larry-DH

    Joined Jun 14, 2010
    784 posts, 430 likes
    Quorning Dragonfly 1200
    US home
    I was doing a solar panel project last weekend and at 5:00pm on Saturday realized I didn’t have usable sealant aboard (my 4200 had cured in the tube). At the time and place, my best bet was a nearby Home Depot, and took off in search of....
    The HD had 5200 in large tubes, but I’m not a fan of 5200 for various reasons. Right next to that they had PL Marine Adhesive Sealant. http://www.loctiteproducts.com/en/p...loctite_pl_marinefastcureadhesivesealant.html
    “Loctite PL Marine Fast Cure Adhesive Sealant is a fast setting, moisture cure polyether adhesive sealant which delivers strong bonds while forming a watertight, flexible seal above or below the waterline once cured. Free of solvents, phthalates and isocyanates, it will not shrink when cured, discolor from UV exposure, or bubble on damp surfaces. Once cured, it withstands both saltwater and freshwater environments.
    • Cures in 24 hours
    • Ideal for marine areas and conditions
    • Withstands salt water & fresh water
    • Fast cure
    • Water tight
    • Above or below waterline once cured
    • Stong bond
    • Permanently Flexible
    • Paintable
    • Won't shrink or discolor from UV exposure”
    I tried it, and I found it very easy to work with. Easy to control the bead, without pulling out into long strings as you withdraw the nozzle from the work piece. I misted it with fresh water before leaving, and next morning it was skinned over and dry to the touch. This is my new go-to replacement for 4200.
    (Also, it is about 30% less expensive than the 3M alternatives).
     


    rgranger likes this.
  2. dirt rd

    dirt rd

    Joined Feb 11, 2017
    57 posts, 13 likes
    Gulfstar 47
    US NC
    I would try this. I’m looking for led cabin reading lights. Not $60+.
     


  3. dlochner

    dlochner

    Joined Jan 11, 2014
    3,885 posts, 1,842 likes
    Sabre 362
    113 US Fair Haven, NY
  4. colemj

    colemj

    Joined Jul 13, 2004
    51 posts, 22 likes
    -Manta Catamaran -Manta 40
    US Mystic, CT
    I've been using this for years. Locktite used to also make a polyurethane, but I can't seem to find it anymore. The price of it has also doubled in the past 2yrs. When it first hit the market, it was under $5. 3M used to make a polyether - it was called "101", and I liked that stuff, but they pulled it off the market several years ago for some reason. Outside the US, one can find a 3M polyether in hardware stores that seems to be the same thing, only inexpensive.

    Mark
     


    Captain Larry-DH likes this.
  5. Captain Larry-DH

    Captain Larry-DH

    Joined Jun 14, 2010
    784 posts, 430 likes
    Quorning Dragonfly 1200
    US home
    Interestingly, after my initial post above -- I searched for polyether sealant and one of the hits was 3M 4000UV. Perhaps that's 101 rebranded?

    PS - @colemj Good to hear from you, Mark. Are you back north in our area?
     


    Last edited: Jun 20, 2019
  6. colemj

    colemj

    Joined Jul 13, 2004
    51 posts, 22 likes
    -Manta Catamaran -Manta 40
    US Mystic, CT
    I also found the Locktite polyurethane I though went missing. It used to be called PL40 or something like that, now it is called "door and window sealant", or similar. I've had poor luck with 4000UV in the past, but never with 101. They could be the same, and my applications different.

    We are in Georgia. Bought a new boat (Dolphin 460) and are busy with a refit.

    Mark
     


  7. Maine Sail

    Maine Sail Moderator

    Joined Feb 6, 1998
    10,987 posts, 767 likes
    Canadian Sailcraft 36T
    US Casco Bay, ME
    Yes UV 4000 is a polyether but polyether and polysulfide are two entirely different products. 3M 101 was an excellent polysulfide, I liked it much better than the Boatlife polysulfide. Unfortunately 3M discontinued 3M 101..
     


  8. gettinthere

    gettinthere

    Joined Nov 26, 2008
    1,867 posts, 162 likes
    Endeavour 42
    US Cruisin
    Since both 3m 4000 and the loctite are both polyether, will they both harden in the tube a few days after opening?

    I have had excellent results keeping opened tubes of 4000 and 5200 in the freezer for extended periods. I always use a fresh tube below waterline but older opened tubes of the 4000 have worked great.
     


    Captain Larry-DH likes this.
  9. Captain Larry-DH

    Captain Larry-DH

    Joined Jun 14, 2010
    784 posts, 430 likes
    Quorning Dragonfly 1200
    US home
    Good luck with the new boat.
     


  10. thinwater

    thinwater

    Joined Mar 26, 2011
    2,344 posts, 572 likes
    Corsair F-24 MK I
    US Deale, MD
    Lockt
    Lockite PL S40 (white) and PL S30 (black). Yes, they say "door and window" and "roof and flashing" respectively, but they are the same product. They are very much like 3M 4200, but more prone to yellowing and mildew. That said, the mechanical durability on boats and on test panels is virtually identical. I've been using them for about 15 years. At the very least, it should have some uses around the house!

    http://sail-delmarva.blogspot.com/2017/05/100-best-buys-chapter-2.html

    The PL polyurethances also bond better to low energy (polyethylene etc.) plastics considerably better than 3M. In this case I used PL S30 to rebuild a kayak skeg, laminating it with Sunbrella. Tough and flexible. That was a year ago, and the only damage is a little ground off the edge.
    [​IMG]
     


  11. colemj

    colemj

    Joined Jul 13, 2004
    51 posts, 22 likes
    -Manta Catamaran -Manta 40
    US Mystic, CT
    Doh! You're right! 101 was a polysulfide. I liked it because it never yellowed, where Boatlife has always yellowed and flaked on me no matter what it says on the tube.

    Outside the US, we often find a 3M polyether, and I was confusing that with 101.

    Mark
     


  12. BobbyFunn

    BobbyFunn

    Joined Apr 16, 2017
    572 posts, 223 likes
    Federation NCC-1701
    US Riverside
    Appears to work on "plastic". Ill bite, in the middle of a few projects where ill test it out.

    Any issues with surface prep after its been removed, e.i., anything like silicone contamination?
     


  13. Captain Larry-DH

    Captain Larry-DH

    Joined Jun 14, 2010
    784 posts, 430 likes
    Quorning Dragonfly 1200
    US home
    I don't think so.
     


  14. DianaOfBurlington

    DianaOfBurlington

    Joined Jun 5, 2010
    988 posts, 54 likes
    Hunter 25
    US Burlington NJ
    I make it a point to not shop for boating products, especially for structural applications, at HoDePo. Now if you'd said that Defender or APS carried it, I'd have checked it out. :dancing:
     


    Rick D likes this.


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