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  1. #1
    Join Date
    Aug 2020
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    Deerfield, NH
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    Default Interlux underwater seam compound

    I need to buy Interlux underwater seam compound. In my search, shopping online, I came across it sold through various distributors including Amazon. West Marine and Amazon price it around $64/ qt., and Jamestown Distributors at $46 with the can labelled differently as Interlux AkzoNobel (parent company).

    That is a dramatic difference for the same quantity. Any idea why? That's bizaar. My initial thought was shelf life but that would probably only apply to product at local stores, which typically don't have the demand.

  2. #2
    Join Date
    Oct 2009
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    South Puget Sound/summer Eastern carib./winter
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    Default Re: Interlux underwater seam compound

    20 bux...not a drastic diff. boats are 'spensive.
    free delivery?

  3. #3

    Default Re: Interlux underwater seam compound

    Amazon is a crapshoot on some items, but the price discrepancies tend to be due to individual Amazon storefront owners throwing the dice in the hopes that shoppers won't bother to check other options. All one can do is shop around and compare the final delivered price. J-D is usually pretty reasonable IMO.

  4. #4
    Join Date
    Jul 2003
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    Concord, NH, USA
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    561

    Default Re: Interlux underwater seam compound

    I bought a quart of the above-the-waterline variety last year from JD for $46. It was fine. Agree that sometimes Amazon prices are bizarro!

  5. #5
    Join Date
    Aug 2020
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    Deerfield, NH
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    Default Re: Interlux underwater seam compound

    Thanks!

  6. #6
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    Jul 2013
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    Branchville, NJ
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    Default Re: Interlux underwater seam compound

    Hamilton Marine $36

  7. #7
    Join Date
    Mar 2006
    Location
    La Conner, WA
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    473

    Default Re: Interlux underwater seam compound

    ...or, you can mix up some straight Portland Cement, and if you boat is tired you could add some old red bottom paint to make it brown like Inter Lux. Or, cement and roofing tar.

    I am not pulling your leg.

  8. #8
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    Jul 2003
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    Concord, NH, USA
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    561

    Default Re: Interlux underwater seam compound

    How does Portland cement respond to the movement of the planking? I imagine it would be kind of brittle, no?

  9. #9
    Join Date
    Mar 2006
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    La Conner, WA
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    Default Re: Interlux underwater seam compound

    Quote Originally Posted by guillemot View Post
    How does Portland cement respond to the movement of the planking? I imagine it would be kind of brittle, no?
    It has been put in the seams of quickly built fishing fleet hulls as well as very high end yachts for at least 70, if not a hundred years.

  10. #10
    Join Date
    Feb 2017
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    Seattle, W.A., U.S.A
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    Default Re: Interlux underwater seam compound

    It handles it just fine. It's in the seams of every working boat in Seattle and many of the yachts.

  11. #11
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    Jul 2003
    Location
    Concord, NH, USA
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    Default Re: Interlux underwater seam compound

    Just below the waterline, or above too? That is the most counter-intuitive thing! But if people earning a living with their boats use it, it must be working for them!

  12. #12
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    Default Re: Interlux underwater seam compound

    Quote Originally Posted by guillemot View Post
    Just below the waterline, or above too? That is the most counter-intuitive thing! But if people earning a living with their boats use it, it must be working for them!
    I was only involved with yachts at Vic Franck’s, so straight Portland Cement on the underwater seams, of which there were few as these boats were double diagonal planked. The garboards and hood ends only were caulked and payed with cement. All the rest of the planking were wedge seam construction, so seams never showed.
    And I would recommend if you mix in bottom paint or roofing tar (bear ****) that you stop below the waterline or your seams will bleed, giving away the color of your additive.

  13. #13
    Join Date
    Oct 2009
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    Default Re: Interlux underwater seam compound

    Makes one wonder how cement is good but epoxy is bad ?

  14. #14
    Join Date
    Feb 2017
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    Seattle, W.A., U.S.A
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    Default Re: Interlux underwater seam compound

    We only use it below the waterline, above it will dry out and fall out.

  15. #15
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    Default Re: Interlux underwater seam compound

    Quote Originally Posted by Pelirrojo View Post
    We only use it below the waterline, above it will dry out and fall out.
    These vessels are in the water 50 weeks a year generally, no?

  16. #16
    Join Date
    Feb 2017
    Location
    Seattle, W.A., U.S.A
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    230

    Default Re: Interlux underwater seam compound

    Yes, I suppose that is a point very very well worth mentioning. It works great if the boat is kept In the water, I doubt it would be nearly as good in a place that regularly hauls boats for the winter.

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