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Gelcoat Discoloration

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  • Gelcoat Discoloration

    The gelcoat on my Mack is discolored on the hull. The top side has an even color. I have tried oxalic acid with limited success, it removes the obvious rust spots and lightens the "staining" to some degree. I hope to avoid respraying gelcoat if possible.

    Please look at the pictures an let me know if you have any recommendations.

    Thank you and Happy New Year to all my fellow Shamrockers!



    Last edited by tuner; 12-30-2017, 11:38 AM.
    Steve
    1998 260 Mackinaw Sea Maxx 5.7 HO TBI 12' Klamath w/ 20hp Tohatsu EFI

  • #2
    Mine had a lot of that when I repainted mine and after a couple years, it started to show up again. Don't have any idea for a fix though.
    Atlantic City, NJ
    1982 Cuddy, Rebuilt 351 .060 rings, Edelbrock carb

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    • #3
      My Hardtop has what looks like the same thing on the starboard bow. I originally thought it might be a repair but after talking with the original owner,I'm the second he said he never had any repair work done. I'm guessing that when they came out of the molds there was work to be done sometimes. Over the course of over 30 years it's discolored a bit.

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      • #4
        Thanks guys. Post mold repair seems likely. My first thought was some type of environmental exposure. All of the deck and house are fine aside from oxidation. Its not bad enough to justify spraying it, yet.
        Steve
        1998 260 Mackinaw Sea Maxx 5.7 HO TBI 12' Klamath w/ 20hp Tohatsu EFI

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        • #5
          Wash the hull with Rust-Aid. I get it at a Do It Best hardware and the name has been changed to Goof-Off rust remover. Acid that removes gelcoat oxidation just like any other oxidation. Want to clean up the metal? Rub it with P B Blaster or Kroil. Think about it. What are they designed to do? Want to put a quick shine on that gelcoat. Wipe it down with ATF or better yet, one of the paint additives that are for better brush flow, such as Penetrol. Won't last months but it is easy, quick and cheap.
          1988 26' cuddy
          1975 20' open
          16' Sandpiper
          14' Certified Fiberglass

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          • #6
            Originally posted by Quik Fix View Post
            Wash the hull with Rust-Aid. I get it at a Do It Best hardware and the name has been changed to Goof-Off rust remover. Acid that removes gelcoat oxidation just like any other oxidation. Want to clean up the metal? Rub it with P B Blaster or Kroil. Think about it. What are they designed to do? Want to put a quick shine on that gelcoat. Wipe it down with ATF or better yet, one of the paint additives that are for better brush flow, such as Penetrol. Won't last months but it is easy, quick and cheap.
            Thanks Quik ! I'll look for some Rust-Aid.
            Steve
            1998 260 Mackinaw Sea Maxx 5.7 HO TBI 12' Klamath w/ 20hp Tohatsu EFI

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            • #7
              Goof-Off Rust Aid Click image for larger version

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              1988 26' cuddy
              1975 20' open
              16' Sandpiper
              14' Certified Fiberglass

              Comment

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