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Thread: Watertight hatch, surgical tubing

  1. #1
    Join Date
    Aug 2018
    Location
    San Jose, CA, USA
    Posts
    26

    Default Watertight hatch, surgical tubing

    Hey all. This is a picture of some seat-top hatches I've partly constructed. My initial plan was to add an additional plywood lip protruding up from the edge of the ledge you can see in the photo to create a trough. I would then contact cement to glue down a gasket of latex tubing like in this ptwatercraft page.

    I'm wondering if instead of adding that additional lip, it might work if I just glued the gasket onto the existing ledge and compressed it sufficiently. Does anyone have experience with this method who would be willing to give advice?

  2. #2
    Join Date
    Dec 2003
    Location
    Sound Beach, NY
    Posts
    3,930

    Default Re: Watertight hatch, surgical tubing

    I haven't done it. But I also brew beer and have seen pictures of kettles converted to airtight fermenters using surgical tubing as gasket.

  3. #3
    Join Date
    Aug 2018
    Location
    San Jose, CA, USA
    Posts
    26

    Default Re: Watertight hatch, surgical tubing

    How is it done? Is the gasket sort of "smushed flat" like in my proposed method, or is it compressed in a groove or channel like the pt watercraft method?

  4. #4
    Join Date
    Jun 2000
    Location
    Pleasant Valley NS Canada
    Posts
    17,681

    Default Re: Watertight hatch, surgical tubing

    Do not eliminate the inner lip - it will leak that way.

    Also, consider fitting a drain tube from the lip to the bilge to drain water from the lip. Use the same tubing as you use for the gasket.

    Finally, glue the ends of the tubing gasket together, else they will leak around the seam.
    Hope for the best, but plan for the worst.

  5. #5
    Join Date
    Aug 2018
    Location
    San Jose, CA, USA
    Posts
    26

    Default Re: Watertight hatch, surgical tubing

    Thank you, that's very helpful. For 1/4" O.D. Tubing, how much should I leave above the groove to be compressed? 1/8"?

  6. #6
    Join Date
    Jun 2003
    Location
    Central Coast, Ca
    Posts
    23,951

    Default Re: Watertight hatch, surgical tubing

    Gutters are nice for cockpit seat hatches. Unfortunately mine seem to drain right into my boot. Closed cell foam is good.


  7. #7
    Join Date
    Nov 2011
    Location
    Salt Spring Island, BC
    Posts
    6,328

    Default Re: Watertight hatch, surgical tubing

    I'm doing some by installing a raised coaming then an overlapping hatch with this seal on the bottom of the hatch where it sits on the deck. It won't leak and is easier than gutters. It's not flush though.

    https://www.amazon.ca/Trim-Lok-D-Sha...ateway&sr=8-11


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