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  1. #1
    Join Date
    Mar 2017
    Posts
    11

    Default Rust spots on deck gel coat

    Based in Gosport, particularly after the boat has been on the hard for a few days I get small annoying rust spots on white deck gel coat. Probably caused by metal particles in the air from activity in the boatyard. Very difficult to remove. Does anybody have any cleaning recommendations, or suggestions on cause?

  2. #2
    Join Date
    Dec 2001
    Location
    Grenoble
    Posts
    17,672

    Default Re: Rust spots on deck gel coat

    Quote Originally Posted by daverebbettes View Post
    Based in Gosport, particularly after the boat has been on the hard for a few days I get small annoying rust spots on white deck gel coat. Probably caused by metal particles in the air from activity in the boatyard. Very difficult to remove. Does anybody have any cleaning recommendations, or suggestions on cause?
    You have got to remove the iron that is embedded in or lying on the surface of the gel coat if it won't wash and brush of a mild acid should dissolve them. Apply it locally.

  3. #3
    Join Date
    May 2007
    Location
    Cambridge
    Posts
    909

    Default Re: Rust spots on deck gel coat

    Oxalic acid is your friend (see ebay, don't buy the stuff in chandlers) - I usually just add a teaspoon of crystals into a mug of cold water and paint it on with a small paint brush.
    Save someone's life ... https://www.mind.org.uk/donate

  4. #4
    Join Date
    Jul 2002
    Location
    Home: Kent. Boat: Chichester
    Posts
    40,070

    Default Re: Rust spots on deck gel coat

    Quote Originally Posted by daverebbettes View Post
    Based in Gosport, particularly after the boat has been on the hard for a few days I get small annoying rust spots on white deck gel coat. Probably caused by metal particles in the air from activity in the boatyard. Very difficult to remove. Does anybody have any cleaning recommendations, or suggestions on cause?
    Oxalic acid or a preparation containing oxalic acid ( eg Y10) will easily remove the stain but if hot iron or steel particles ( eg from grinding ) have become embedded into the surface the stains will continue to recur until the metal particles have been removed or have corroded away.

  5. #5
    Join Date
    Aug 2009
    Location
    Guildford, Surrey
    Posts
    1,198

    Default Re: Rust spots on deck gel coat

    Claybar, if the above fails to dissolve or if they have become bonded.

  6. #6
    Join Date
    Jun 2013
    Location
    Hopefully somewhere warm
    Posts
    6,429

    Default Re: Rust spots on deck gel coat

    Phosphoric acid will dissolve the rust, but as above there might be some specks still in there.

    Available from wickes-

    http://www.wickes.co.uk/Wickes-Grout...etails_content

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