Custom Extended Swim Platform

Discussion in 'Boatbuilding' started by tpenfield, Jan 8, 2019.

  1. tpenfield
    Joined: Dec 2016
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    Location: Cape Cod, MA

    tpenfield Senior Member

    I'm going to add some braces on the sides to stiffen up those areas . . .

    First I cut & shaped the foam core pieces.

    IMG_2497.JPG

    IMG_2498.JPG

    Then I covered them with 1708 cloth. Here they are after curing, but still needing a bit of trimming.

    IMG_2500.JPG

    I'll tab these into the sides with more 1708.
     
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  2. tpenfield
    Joined: Dec 2016
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    tpenfield Senior Member

    I am traveling the next couple of weeks, so I won’t be back at it until Memorial Day weekend.

    Remaining work is:

    Aft area
    Pylon stiffeners
    A few touch-up spots

    Then, I will be ‘popping’ the platform out of the mold.

    Targeting to be done/installed mid-June.
     
  3. fallguy
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    fallguy Senior Member

    A friendly tip...stainless steel luvs to gall. Despite the issues with grease in the fabrication area, make sure and grease the bolts if you are putting nuts on them.

    I had one of four of my hardware connections on a project fail and it took an hour to remove and the bolt basically came apart due to the galling.

    I had told myself I was going to lube the connections immediately after my glasswork. Fail. Fortunately, the rivnut installation (female side) was so tough, I was able to simply tap it and while less thread, still enough to avoid removing the rivnut.
     
  4. fallguy
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    fallguy Senior Member

    These look great and the gc will thank you.
     
  5. tpenfield
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    tpenfield Senior Member

    Galling. . . I had to Google that.

    A definite yes on the grease, as it will be salt water exposure, which will add its own challenges.
     
  6. tpenfield
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    tpenfield Senior Member

    “gc”. ???
     
  7. fallguy
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    fallguy Senior Member

    Gelcoat won't get a stress fracture.
     
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  8. tpenfield
    Joined: Dec 2016
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    tpenfield Senior Member

    Update . . .

    After a couple of weeks doing other stuff, I am back at it with the swim platform.

    I made the rear structure shapes out of the foam board stock that I used for the coring.

    IMG_2550.JPG

    Then I filled them with the pour-in foam and sanded them smooth, rounded corners, etc.

    IMG_2554.JPG

    Then came the glass . . .

    IMG_2559.JPG

    Now I am setting up the infusion.

    IMG_2563.JPG

    Still casing a leak or 2 . . . so won't do the resin until tomorrow.

    TTFN . . . :D
     
    Last edited: May 26, 2019
  9. fallguy
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    fallguy Senior Member

    I am rather surprised you didn't jist wetbag that section.
     
  10. tpenfield
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    tpenfield Senior Member

    I thought about it, not for long though . . . With all the various shapes and irregularities, I figured wet bagging would be a race of time before the resin kicked. I think I am better off doing it by infusion.
     
  11. tpenfield
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    tpenfield Senior Member

    The aft structure and side stiffeners are all glassed. Just finishing up a few odds and ends, then I will be pulling the platform from the mold next weekend (June 1st)

    IMG_2567.JPG
     
  12. tpenfield
    Joined: Dec 2016
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    tpenfield Senior Member

    Question for the membership . . .

    In terms of adhering the 'slab' portion of the extended platform over the existing swim deck . . . 3M 5200 (permanent) or 3m 4200 (semi permanent) ??? :confused:

    Thoughts either way?
     
  13. tpenfield
    Joined: Dec 2016
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    tpenfield Senior Member

    The platform is now out of the mold . . .

    IMG_2601.JPG

    IMG_2605.JPG

    Overall it looks OK . . . There are a few dry spots, so those will need some touch-up. I think I'll take care of those before washing off the PVA film.

    Next steps will be trimming and some sanding.
     
  14. fallguy
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    fallguy Senior Member

    Pretty nice outcome.

    How heavy?

    As for the gluing, how much gets glue?

    I don't think I'd use 5200.

    I'd use 4000 UV
     

  15. fallguy
    Joined: Dec 2016
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    fallguy Senior Member

    The touch up is to be expected, but I don't understand how leaving the pva on will help unless it highlights the areas needing work. I would worry about it contaminating the repair.
     
    Blueknarr likes this.
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