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    3870 hull SF?-gctid342959

    Does anyone know what the SQ FT is for a 3870 hull sides only, I may be re-gelcoating this spring; no I will not paint!

    I need to calculate the amount of gelcoat for about 35 mils wet, 1 gal for 35 SF. I am estimating 10 gal. white.
    Pat says: DO-IT-RIGHT THE FIRST TIME!

    Bayliner 3870 "ALASKA33)
    Twin 350 GM power
    Located in Seward, AK
    Retired marine surveyor

    #2
    You are going to average a bit more than 5' from waterline to rub rail - sides are going to be ~40' Transom is really close to 13' and ~4' above waterline

    452square feet give or take.

    I understand the desire (durablity to dock rash) to not paint to some degree but it washes and holds a shine so much better I think that is the direction I would go.
    1999 Sandpiper Pilothouse - Current
    1989 3888 - 2011-2019, 1985 Contessa - 2005-2011, 1986 21' Trophy 1998-2005
    Nobody gets out alive.

    Comment


      #3
      If there is an insurance claim with paint, the whole boat must be painted, or it will never match, this is what an insurance agent teaching at the Chapman school of marine surveying instructed us that would occur in a claim, it is easy to repair a standard color such as white with gelcoat. I knew someone woud suggest paint, I have seen too many issues with paint, my next door boat owner has the kind of issue I am suggesting, very expensive fix. Large yachts when the paint is compromised by an accident, they (the ins. co.) paint the whole boat. End of subject of paint here! I figured 350 sf for a full 35 mils, I can get by with 30 mils if I can spray with-out a lot of orange peal to sand off.

      I do appreaciate the input though.

      Pat
      Pat says: DO-IT-RIGHT THE FIRST TIME!

      Bayliner 3870 "ALASKA33)
      Twin 350 GM power
      Located in Seward, AK
      Retired marine surveyor

      Comment


        #4
        boatworkfl wrote:
        If there is an insurance claim with paint, the whole boat must be painted, or it will never match, this is what an insurance agent teaching at the Chapman school of marine surveying instructed us that would occur in a claim, it is easy to repair a standard color such as white with gelcoat. I knew someone woud suggest paint, I have seen too many issues with paint, my next door boat owner has the kind of issue I am suggesting, very expensive fix. Large yachts when the paint is compromised by an accident, they (the ins. co.) paint the whole boat. End of subject of paint here! I figured 350 sf for a full 35 mils, I can get by with 30 mils if I can spray with-out a lot of orange peal to sand off.

        I do appreaciate the input though.

        Pat
        Apparently cars never match when they are repaired either...

        Paints will match great if you have the formula/code that was mixed, blending them in is a bit harder but still very doable if the painter has any skill. If a quarter fender is repaired on one side of the car - the entire roof and other quarter don't get painted just because there is no hard line to mask to.

        I have had more trouble matching old gelcoat than paint.

        Each has its merits but so long as you are not routinely bouncing off docks/boats as you come into port a paint job is lower maintenance than gelcoat and the little bit of work to take care of it is easier.
        1999 Sandpiper Pilothouse - Current
        1989 3888 - 2011-2019, 1985 Contessa - 2005-2011, 1986 21' Trophy 1998-2005
        Nobody gets out alive.

        Comment


          #5
          In the long run Awlgrip really is more practical, better finish and will last longer unless you're going to go with a plain white color, then gel coat probably is better. If you do go with LPU, in the case of an accident you do not have to paint the whole boat, just one side.

          Interlux is close to making a new LPU that you can sand and buff, just like gelcoat that will be "fixable"
          www.boatyardgm.com
          www.pacificyachtimports.net
          2002 Carver Voyager 57
          "Making Waves"
          3988 250 Hinos
          "The Dark Side"
          Alameda, California

          Comment


            #6
            I was quoting an insurance adjuster that works in the corporate hq, of a major boat insurance company, he referenced a large yacht that was damaged slightly while at dock, the insurance co. painted the whole boat.

            When painting only part of a boat, there needs to be a match line, it is rather hard to hide that match line with the thin paint on a boat.

            Get a scrape on the side of the hull with paint and try to hide it, very hard to do, easy with white gel coat, painting a car and a boat is quite different, most boat paints are not able to be buffed.

            Most if not all large yachts are sanded and painted, try and tell one of those owners that they should settle for a patch paint job, you will loose the argument.

            Now if your adjuster can talk you into 1/2 of a paint job, it is your fault.

            There will never be any paint on my boat, I even re-gelcoated my bilge while the engines were out.

            reprinted from the bertram31 site

            The resulting finish and the nature of the gelcoat will far exceed a painted surface in terms of longevity and repair ability, but you'll see why painting is the less expensive alternative. Gelcoat is less expensive in terms of material costs, but that is outweighed in terms of labor costs... Over a 20 year period the gelcoat becomes more cost effective, especially when compared with Awlgrip on topside surfaces since there would be at least 1 if not more re-paint jobs needed.
            Pat says: DO-IT-RIGHT THE FIRST TIME!

            Bayliner 3870 "ALASKA33)
            Twin 350 GM power
            Located in Seward, AK
            Retired marine surveyor

            Comment


              #7
              Your gelcoat may match perfectly initially but unless you have the exact formula of the original, it may age differently. There are many ways to get to the same color and all age differently.

              Just saying that just because one guy said one thing it may not apply to all situations.

              But you asked for the square feet, got it, so good luck with your project

              Comment


                #8
                boatommy wrote:
                Your gelcoat may match perfectly initially but unless you have the exact formula of the original, it may age differently. There are many ways to get to the same color and all age differently.

                Just saying that just because one guy said one thing it may not apply to all situations.

                But you asked for the square feet, got it, so good luck with your project
                Going with pure white iso gel coat. Not the first boat hull I have sprayed. Thanks.
                Pat says: DO-IT-RIGHT THE FIRST TIME!

                Bayliner 3870 "ALASKA33)
                Twin 350 GM power
                Located in Seward, AK
                Retired marine surveyor

                Comment


                  #9
                  Like I said, if your going white gelcoat is preferred, no doubt about it. I don't buy into the gelcoat will last longer than LPU in a colored boat hull though, blue, green, red gelcoat hulls look terrible within just a few years as they fade where LPU keeps its color much longer.

                  Good luck with the project
                  www.boatyardgm.com
                  www.pacificyachtimports.net
                  2002 Carver Voyager 57
                  "Making Waves"
                  3988 250 Hinos
                  "The Dark Side"
                  Alameda, California

                  Comment


                    #10
                    NeilW wrote:
                    Like I said, if your going white gelcoat is preferred, no doubt about it. I don't buy into the gelcoat will last longer than LPU in a colored boat hull though, blue, green, red gelcoat hulls look terrible within just a few years as they fade where LPU keeps its color much longer.

                    Good luck with the project
                    Thanks, Pat S.
                    Pat says: DO-IT-RIGHT THE FIRST TIME!

                    Bayliner 3870 "ALASKA33)
                    Twin 350 GM power
                    Located in Seward, AK
                    Retired marine surveyor

                    Comment

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