CSM vs 1/2" milled fibers

Discussion in 'Materials' started by midcap, Jan 31, 2021.

  1. midcap
    Joined: Oct 2013
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    midcap Junior Member

    I had to cut out some delaminated CSM with gel coat on top.

    I was just going to put CSM back in the repair, but I started to think.

    What if I just used my 1/2 or 1" chopped fibers and mixed it in my resin to make cat hair and just put that in. It would make fairing it out much easier.

    The problem is, I am not sure it they are equal in strength or not. I am assuming it really doesn't matter as the core below is the structural piece and the CSM is just there for weather proofing.
     
  2. Mr Efficiency
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    Mr Efficiency Senior Member

    You perhaps should provide a few more details, of this repair, where it is etc, what the core is.
     
  3. midcap
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    midcap Junior Member

    It's on the deck of a boat, 1/2" plywood core. The deck is just gel coat over CSM. It's a TwinVee, finish is similar to a carolina Skiff.

    [​IMG]
     
  4. ondarvr
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    ondarvr Senior Member

    Use CSM, it will be stronger and lay down better.
     
  5. Mr Efficiency
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    Mr Efficiency Senior Member

    Ok, well that would be "flow coat" rather than gelcoat. It isn't a critical repair, but to get the best adhesion, brush a little resin on to it, before adding the CSM or your milled fibres "putty", I would use the former.
     
  6. midcap
    Joined: Oct 2013
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    midcap Junior Member

    thanks folks, it's not very wide, so I am going to lay down some csm then go over with the milled fiber putty, this should give me a strong and smoother finish.
     

  7. ondarvr
    Joined: Dec 2005
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    ondarvr Senior Member

    No need for the putty.

    Fill it with CSM and sand it smooth....done.

    Coat it with gel coat or paint.
     
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