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  1. #1
    Join Date
    May 2018
    Posts
    159

    Default Antifouling removal ideas!

    Hello!

    Boat is out again, and the project is to remove all old antiful and go back to gelshield-gelcoat coating. I will then reapply new protection!
    I ve read almost any method online, and i so far i have tried the following with miserable results.

    1) orbital sander...this will take about a decade... sanding with a handsander is much faster that this...
    2) i bought a SKILL electric scrapper. I thought that was going to do it, but either it does nothing ( small angle) or it digs into the gelcoat. ( i pasiently checked every angle, there is no sweet spot were it will remove just the paint..it digs or does nothing.

    I cant afford sandblasting, its to much money for my pocket. I came up to this solution with the angle grinder and this tool on it. Any one has used this on fiberglass?
    https://www.aliexpress.com/i/32854132620.html
    Do it yourself and do it good!

  2. #2
    Join Date
    May 2001
    Location
    UK East Coast
    Posts
    35,507

    Default Re: Antifouling removal ideas!

    You really shouldn't dry-sand antifouling!

  3. #3
    Join Date
    May 2018
    Posts
    159

    Default Re: Antifouling removal ideas!

    Quote Originally Posted by pvb View Post
    You really shouldn't dry-sand antifouling!
    I read someone wetsanded with mesh but he doens't say if he removed to the gelcoat or just for applying a new layer on top of the old... I know it;s going to be small Chernobyl with dry sainding... but i am running out of options.

    Paint remover is another way...but the marine remover is pretty expensive stuff...
    Do it yourself and do it good!

  4. #4
    Join Date
    Oct 2006
    Location
    Bradwell and Leigh-on-Sea
    Posts
    14,398

    Default Re: Antifouling removal ideas!

    Google antifoul stripper. There are various makes.
    Also http://www.ybw.com/forums/showthread...ld-antifouling
    Not all who wander are lost

  5. #5
    Join Date
    Apr 2018
    Location
    Mooring, Faro
    Posts
    1,355

    Default Re: Antifouling removal ideas!

    Took ours back to the epoxy this January, quite an easy job using Sandvik (or Bahco) two handed scraper with carbide blade (corners rounded to stop it digging in), followed by light dry sand with dust extraction. Primed with Jotun Vinyguard.

    P1010118a.jpg

  6. #6
    Join Date
    Jul 2016
    Location
    Oxford & WicorMarine
    Posts
    200

    Default Re: Antifouling removal ideas!

    If you can stand to do it by hand, this sort of tool works very well:
    https://www.amazon.co.uk/Bahco-Carbi...504742&sr=1-23
    I used a cheaper version from screwfix that, they no longer seem to sell, to take all the antifoul off my boat 3 years ago; this one from B&Q is similar -
    https://www.diy.com/departments/harr.../182460_BQ.prd
    It took several days... but it was cheap!
    Steve
    [edit - looks like Graham 376 just got in first with this suggestion!]
    Last edited by sgr143; 10-05-19 at 16:19.

  7. #7
    Join Date
    Jan 2004
    Location
    Bricks & mortar: Italy. Boat: Aegean
    Posts
    10,430

    Default Re: Antifouling removal ideas!

    +1 another with Graham & sg for the Bahco-type scraper. Unless the old antifoul is particularly stubborn , this should work. Tougher bits may respond to softening with home-made stripper of caustic soda and wallpaper paste (skin and eye protection required, etc.)
    All epigrams are false

  8. #8
    Join Date
    Aug 2018
    Posts
    114

    Default Re: Antifouling removal ideas!

    i did this earlier this year , used a harris scraper ex screwfix and wait for it , wallpaper paste - with caustic soda mixed in from bq . i had about a dozen layers to remove and it took time but it worked . apply it quite thick, paste holds the caustic on so it can do its work . leave overnight then scrape - if you are lucky you may get two layers off at a time . its still painfull work but absolutely worth it . dont forget to take all safety precautions .

  9. #9
    Join Date
    May 2018
    Posts
    159

    Default Re: Antifouling removal ideas!

    Thank you all for your replies! Looks like hand scraper is the way to go...I read that polyester is sensitive to caustic soda, but theoriticaly it will never reach gelcoat. Even a litle bit it should not do harm.
    Should i buy extra blades? do they worn out?
    Last edited by Akestor; 10-05-19 at 18:11.
    Do it yourself and do it good!

  10. #10
    Join Date
    Jul 2009
    Location
    Winter in Falmouth, summer on board Rampage.
    Posts
    5,042

    Default Re: Antifouling removal ideas!

    I removed about forty years worth of antifoul from my Hurley 18 this winter. Tried industrial strength stripper: that wound up softening the gel coat as well, so gave that up.... In the end a two handed pull scrapper was the only answer, as others have said. Took about ten hours or so to get rid of the old stuff, mostly in two hour sessions to prevent total back seizure. I found that the blades didn’t need replacing but the Hurley isn’t what you’d call a big boat.

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