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Seal Large Seam in Aluminum Boat

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  • Seal Large Seam in Aluminum Boat

    I have a 1994 Alumacraft 17' boat. It has a 5/16" x 4'6" seam opening at the front of the boat. I have removed the old seam filler/sealer because it is leaking. Any suggestions as to what kind of filler/sealer I can use to fix the crack/leak?


  • #2
    Re: Seal Large Seam in Aluminum Boat

    Check home depot for a 3m 5200 caulking. Its marine grade and it good stuff. Be sure to clean the aluminum prior to application.


    • #3
      Re: Seal Large Seam in Aluminum Boat

      ^^^^yep !
      sigpic 1981 Glastron SX-190 300hp 350 SBC
      Living the Dream


      • #4
        Re: Seal Large Seam in Aluminum Boat

        Hit it with a green scotch-brite pad to clean and scuff the surfaces, give it a wipe down with alcohol or something similar, and use the 3M 5200 suggested above.

        We be boat peeps
        2008 GT-185 3.0l Penta


        • #5
          Re: Seal Large Seam in Aluminum Boat

          What caused the seam to open? Missing rivets?

          I have never seen a 5/16 gap in a hull seam without having some sort of damage or many missing rivets.
          Certainly not on an Alumacraft, and we've had several over 45 years old.
          Medford, WI


          • #6
            Re: Seal Large Seam in Aluminum Boat

            It sounds to me that you must be missing the connecting component, sometimes called a chine, sometimes called an "angle" but there must have been something there before.
            1987 Boston Whaler 18.6 Outrage with Merc 150 and Honda 8.


            • #7
              Re: Seal Large Seam in Aluminum Boat

              Is there a part of the boat missing or are there a ton a loose rivets and how exactly did you remove the sealer????

              You really don't want to band aid this fix, if i am thinking of the correct part that is a huge part of the boat and sealer won't hold.

              Get up a pic if you can so we can have a better idea what you are talking about because that is very out of the ordinary.
              GO IRISH!!!!


              • #8
                Re: Seal Large Seam in Aluminum Boat

                Replace the rivets in that seam and then seal it. Just puting goop on it is a temporary fix.
                I consider overkill a job well done... plus a little extra.

                There's as many ways to do something as there is people to tell you how to do it... but not all of them are the right way.

                The drinking and debauchery will continue until morale improves... and maybe for a little while after.