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  1. #11
    Senior Member JSR's Avatar
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    Re: Stains at the waterline on fiberglass boat

    Sounds like you just have bottom growth. That is what the paint is for, to keep that to a minimum.
    When it is in the water for extended periods you need to hire a diver to go under and clean it with a scotch pad. I pay a dollar a foot twice a month in saltwater.
    Since it is out of the water, park it somewhere that you will not mind the stain on the ground after and start scraping (plastic bondo trowels work ok, not metal, do not gouge the gel) Just get the film off. Then pull out your machine and the cleaner. This will cost you a pad or two cause they will never be clean again.
    If it is something else let us know
    "I love the smell of carnuba in the morning ... it smells like ... victory"
    JSR

  2. #12
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    Re: Stains at the waterline on fiberglass boat

    Marykate On Off Hull Cleaner

  3. #13
    Senior Member PaulMys's Avatar
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    Re: Stains at the waterline on fiberglass boat

    Quote Originally Posted by ig2dx2 View Post
    Marykate On Off Hull Cleaner
    This thread was made before I even joined AGO.

    But, having worked in the marine industry for over 30 years, this is the correct answer.

    And without sounding like an a$$h*le, all of the suggestions offered on page one of this thread are laughable at best.
    It is no coincidence that man's best friend cannot talk.

  4. #14
    Senior Member 57Rambler's Avatar
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    Re: Stains at the waterline on fiberglass boat

    I'd definitely put some anti-fouling paint on her ... West Marine and Pettit both make decent products for this.

  5. #15
    Senior Member PaulMys's Avatar
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    Re: Stains at the waterline on fiberglass boat

    Quote Originally Posted by 57Rambler View Post
    I'd definitely put some anti-fouling paint on her ... West Marine and Pettit both make decent products for this.
    WM and Pettit are far inferior to Interlux products. The price reflects it. (Akin to buying NuFinish vs. Collinite).

    But the OP was asking about stains right above the waterline. That browning that affects the gelcoat just above.
    It is no coincidence that man's best friend cannot talk.

  6. #16
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    Re: Stains at the waterline on fiberglass boat

    You are right about the previous answers being laughable. I was reading thru the old post when I saw the question and had to chime in. Wipe on rinse off and done! No compounding or buffing to remove the dreaded waterline moustache, discoloration or stains. Marykate is like magic. I have used it on topside stains too. Nothing beats Marykate for removing stains from tree leaves in gelcoat. It also removes soap scum on shower tiles and fiberglass shower surrounds. It will remove hard water deposits in toilets and on glass too. For anyone that isn’t familiar with Marykate On Off Hull Cleaner, wear gloves and don’t get it on anything metal!

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