Hull joint sealant/adhesive

Discussion in 'General Maintenance/Repair Questions' started by Thornton69, Feb 26, 2021.

  1. Thornton69

    Thornton69 Active Member

    662
    Sep 15, 2014
    Northern BC
    1981 245 SDC
    2020 Solar 420
    '97 5.7 Bravo 2
    '20 Merc 25 EFI Jet
    We pushed hard through a rough inflow (3-4') last weekend and had some gear get wet in the bow. It appeared to be coming in behind the rub rail. From the outside, it is apparent the joint is separating. Going to pull the rub rail and reseal it. After cleaning it all up, is a urethane adhesive like Dow U-418 a good choice or is there better choices? In a smallish town and supplies are limited but don't want to deal with a mess gone wrong.
     
  2. Golfman25

    Golfman25 Well-Known Member

    Sep 12, 2009
    IL
    281
    V8
    3m 5200.
     
    dwna1a likes this.
  3. sbw1

    sbw1 Well-Known Member

    Oct 10, 2006
    West Michigan
    This is listed in my signature
    This is listed in my signature
    tiara 3600.jpg
    Tiara used 5200 when our boat was built.
     
  4. Henry Boyd

    Henry Boyd Well-Known Member GOLD Sponsor

    Apr 24, 2007
    Newburyport, on the peaceful and serene Merrimack
    ‘09 Sabre 38 Hardtop Express “Serenity”
    Volvo D6 w/IPS450 Pods
    I had to retrofit an underwater fixed trim tab fence to the hull of our boat. Sabre sent me the part but not the adhesive and hardware. The adhesive they wanted used is Plexus MA310, a specialty industrial grade adhesive. They told me it is what they use for joining the hardtops to the deck structure and for the deck to hull seam and preferable to retail/big box products like 5200? It’s apparently a commonly used as I got it from a local industrial supplier.
     
  5. b_arrington

    b_arrington Well-Known Member GOLD Sponsor

    Feb 21, 2007
    Setauket, NY
    Back Cove 37
    AB Ventus 9VL
    Cummins QSC 8.3 600
    I had to pull the rail and seal the joint on my 270 AJ as it was coming apart. I posted a write up.

    The hull to deck joint is one of the rare truly appropriate uses of 3M 5200. It’s what I used.
     
  6. Thornton69

    Thornton69 Active Member

    662
    Sep 15, 2014
    Northern BC
    1981 245 SDC
    2020 Solar 420
    '97 5.7 Bravo 2
    '20 Merc 25 EFI Jet
    Thanks for the input guys. Looked into the Plexus 310. Could not find a distributor in the north. Going to remove the rub rail and get a better look at what I am dealing with this afternoon. 5200 might be the best option for me.
     

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