Heavy mineral deposits on bottom of hull. HELP!!

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  • Stillfarm
    • Apr 2011
    • 1

    • Colorado

    • 2001 Ski Nautique 196, 2003 206 Air Nautique

    Heavy mineral deposits on bottom of hull. HELP!!

    Have tried to buff with rubbing compound, 2000 grit sand paper and have had no luck removing this skudge. The rubbing compound hardly does anything and will not move it. The sand paper seems to move it a little but makes more of a mess because it gum's up. Also I have tried using some denatured alcohol and that does nothing. We think this is mineral deposits from the water in our lake, the boat has been sitting on a lift feet from the water. Probably due to the water splashing up on the bottom repeatedly and then drying. This deposit seems to only be on the center back portion that is most exposed to the water. I will try to include a picture. Any suggestions to getting this off would be great and much appreciated.
  • Chexi
    1,000 Post Club Member
    • Jan 2025
    • 2119

    • Austin

    • 2000 SAN

    #2
    Starbrite hull cleaner. Or muriatic acid and water 50:50 mix. Be careful, this can eat/discolor your bunks. Rinse either one thoroughly.

    http://www.thehulltruth.com/boating-...ning-hull.html

    This thread is helpful. Might want to try the toilet bowl cleaner.
    Last edited by Chexi; 04-24-2011, 03:33 PM.
    Now
    2000 SAN

    Previously
    1999 Air Nautique
    1996 Tige Pre-2000
    1989 Lowe 24' Pontoon / Johnson 100HP outboard

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    • skiinxs
      Senior Member of PLANETNAUTIQUE
      • Jul 2003
      • 374

      • St. Louis

      • 2019 Ski Nautique 6.2 arriving soon

      #3
      Try 50/50 vinegar and water/ If that doesn't work, try CLR or the already mentioned Starbright cleaner.
      Dave
      2019 Ski Nautique 6.2 arriving soon
      16 other Ski Nautiques
      3 MasterCrafts
      18 Ski Supreme's
      1 SlickCraft Squirt Boat

      Comment

      • mrbobolina
        • Sep 2008
        • 107



        #4
        I used a high speed rotary buffer and marine rubbing compound. My buffer has a variable speed of 1000-5000 rpm. It is what you use on smoothing clearcoat or making a paint really bling.

        It is great for something like you are talking about, but you need to know what you are doing with the tool or you can damage the surface by heating up the gell coat.

        Comment

        • CradGen2
          1,000 Post Club Member
          • Aug 2020
          • 1343

          • Horseheads NY

          • 1999 Ski 2000 Sport 2004 SV21 2007 216 1992 Malibu flightcraft 2008 210 2006 ski 2012 - 210 2016 BU 23lsv 1998 Sport 1997 Super Sport

          #5
          I'm not a fan of acid on my boat. When I did leave my boat in the water I used Soft Scrub and a bathroom brush. Takes about 4 hours to do a 196. I do mine dry, hose then come back with soupy water. Wear goggles.

          Comment

          • liquidforce
            • Feb 2011
            • 3

            • Minneapolis

            • 1998 ski nautique

            #6
            I just used Slimey Grimey it works GREAT!!! should work for you.

            mitch

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