Which weight of fibreglass cloth?

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Which weight of fibreglass cloth?

Home Forums Beginners Which weight of fibreglass cloth?

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  • #43810
    Mark Tommy
    Participant
      @marktommy83416

      Hi All

      From your experience which weight of cloth would you use to finish the outside of the hull on a 1 metre long boat?

      I am unsure whether to use 25g or 49g or if indeed there are any other weights.

      I will be using finishing epoxy with it if that helps with the question?

      I think that I understand that the thicker the weave the harder it will be to get a very smooth finish, but I am very patient and speed is not an issue

      Thanks Mark

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      #2312
      Mark Tommy
      Participant
        @marktommy83416

        A newbie unsure of things again

        #43824
        Mark Tommy
        Participant
          @marktommy83416

          Ah – I've just read this again and I think I should have mentioned that it has a wooden hull Shift+R improves the quality of this image. Shift+A improves the quality of all images on this page.

          #43825
          Dave Milbourn
          Participant
            @davemilbourn48782

            You will find the lighter cloth is easier to work around curves and takes less resin to build up a finish. It,s the weight chosen by most aircraft modellers for wings etc.

            Dave M

            #43828
            Mark Tommy
            Participant
              @marktommy83416

              Thanks Dave

              25g was my prefered choice but I have never used it before. In the past I have only ever built boats with fibre hulls so this is my first wooden hull. I want to make sure that its watertight and I also want it to last the test of time

              #43834
              Dave Milbourn
              Participant
                @davemilbourn48782

                Mark

                Thin cloth and resin is used as the basis of a paint finish, not as a strenghtening or waterproofing method.. You will almost certainly sand through it as you attempt to get a smooth finish to the resin. Rather add the heavier weight of cloth to the inside of the hull if that's the main reason for using fibreglass.
                There is a useful article on using epoxy and cloth for wing skinning here, under Aeromodelling > Wing Skinning.doc **LINK**

                Dave M

                #43846
                Mark Tommy
                Participant
                  @marktommy83416

                  Ah! – Now that has given me some food for thought

                  I assumed that by giving the hull a covering of cloth and resin I would acheive not only a good water barrier but also give the hull a bit of resistance to knocks and a surface to paint from too

                  I guess using this method if I do break through the cloth the only waterproofing will be the actual paint? Or do you put anything else on before this process.

                  Thanks for the link I found it very helpful

                  #43868
                  ashley needham
                  Participant
                    @ashleyneedham69188

                    Mark. Eze-cote Acrylic resin and the finest glass cloth gives a fab finish. One side at a time can be done in one hit, and after several coats of resin later and a bit of very easy sanding, you will have a nice smooth surface. Do this on a warm day and it will only take the one day to complete.

                    With eze-cote you will not need to snad forever or very hard, and so there is not much likelyhood of breaking through the fibreglass. This will not be as thick a coating as using epoxy, so the underneath needs to be a tad smoother.

                    Just as an alternative.

                    Ashley

                    #43876
                    Mark Tommy
                    Participant
                      @marktommy83416

                      Thanks Ashley thats great information – I'll look into that as it sounds like a good product

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