Reducing poultice corrosion

Discussion in 'Fiberglass and Composite Boat Building' started by fallguy, Apr 8, 2022.

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  1. fallguy
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    fallguy Senior Member

    D4D6D35A-C935-4236-94D7-93FEE4B39C39.jpeg

    So, saltwater collecting and drying on the inside near the hardware track?
     
    fallguy, Apr 11, 2022
    #16
  2. bajansailor
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    bajansailor Marine Surveyor

    I presume that this is the section of your aluminium cross beams - is it mounted on the boat vertically as shown?
    Or is it mounted horizontally, and the track is used for sliders for the trampoline?
     
    bajansailor, Apr 11, 2022
    #17
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  3. fallguy
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    fallguy Senior Member

    3 of them hold the hulls together; the tramp beam is 4,5"od aluminum 6061
     
    fallguy, Apr 11, 2022
    #18
  4. Ad Hoc
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    Ad Hoc Naval Architect

    Yes. If water cannot freely drain out from these small regions - it may cause issues.
    You need to flush with fresh water..or...depending upon where these regions are... why not remove this possibility by filling the cavity with sealant like sikaflex?
    You need to ensure it is 100% filled and no voids..or that could be worse!
     
    Ad Hoc, Apr 11, 2022
    #19
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  5. fallguy
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    fallguy Senior Member

    Fill what cavity? You mean cap the ends of the beams? Just want to be clear.
     
    fallguy, Apr 11, 2022
    #20
  6. Ad Hoc
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    Ad Hoc Naval Architect

    The cavity you mentioned as a region of concern:

    upload_2022-4-12_9-3-33.png
     
    Ad Hoc, Apr 11, 2022
    #21
  7. fallguy
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    fallguy Senior Member

    It is facing down. I am more worried about ingress getting inside. Thus the confusion. It is a really large cavity and would take like 50 tubes of caulk.

    A18FB008-CD72-4112-910E-DAACF0F45000.jpeg
     
    fallguy, Apr 11, 2022
    #22

  9. Ad Hoc
    Joined: Oct 2008
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    Ad Hoc Naval Architect

    I can only present options based upon the data; any mitigation is down to you, it's your boat after all.
     
    Ad Hoc, Apr 11, 2022
    #23
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