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  1. #1
    Join Date
    Oct 2014
    Location
    Benfleet, Essex/Keswick, Cumbria
    Posts
    1,893

    Default hole in gel coat below waterline after jetwashing, best fix?

    Kind of flaked off when pressure washing, on the underside of the hull above the keel; whats the best way to deal with this please?

    Cheers.
    jojo-gelcoat-2.jpg

    jojo-gelcoat-3.jpg

  2. #2
    Join Date
    Feb 2007
    Location
    Essex
    Posts
    22,893

    Default Re: hole in gel coat below waterline after jetwashing, best fix?

    You have only removed what was going to come off anyway. I would fill it with epoxy and a blob of antifoul after removing all the loose stuff and sail the rest of the season. In the winter I would strip the whole surface, or maybe sell the boat!
    Far away is near at hand in images of elsewhere

  3. #3
    Join Date
    Jul 2002
    Location
    Home: Kent. Boat: Chichester
    Posts
    43,614

    Default Re: hole in gel coat below waterline after jetwashing, best fix?

    Quote Originally Posted by steve yates View Post
    Kind of flaked off when pressure washing, on the underside of the hull above the keel; whats the best way to deal with this please?

    Cheers.
    Epoxy putty ......... "Milliput" frequently recommended on these forums

  4. #4
    Join Date
    Jul 2006
    Posts
    4,819

    Default Re: hole in gel coat below waterline after jetwashing, best fix?

    It's gelcoat flaking off. Presumably not a newish or high value boat (not trying to be nasty). Scrape, prise off any loose edges, till it doesn't want to come off any more. Get as clean as you can then wipe with acetone, let dry (doesn't take long) then fill with epoxy filler (Plastic Padding do one). Milliput would not be my choice for this. Sand smoothish. Antifoul with the rest of the hull. Go sailing.

  5. #5
    Join Date
    Oct 2014
    Location
    Benfleet, Essex/Keswick, Cumbria
    Posts
    1,893

    Default Re: hole in gel coat below waterline after jetwashing, best fix?

    ok, she isnt going in the water till next summer anyway, too many other jobs to be done, so I have plenty time to do it properly. Though I wont be stripping the whole hull and re gelcoating, its a 1974 longbow.

  6. #6
    Join Date
    Oct 2001
    Location
    Surrey & boat in Dorset. Both have pubs
    Posts
    3,796

    Default Re: hole in gel coat below waterline after jetwashing, best fix?

    As per others but I would grind the surface a bit to get the exposed grp clean and then epoxy with thickeners, etc.

  7. #7
    Join Date
    May 2001
    Location
    South Dorset/moored Poole/lay up Wareham
    Posts
    340

    Default Re: hole in gel coat below waterline after jetwashing, best fix?

    Quite rare for gel coat/laminate bonding failure, could it be an old local hull repair or perhaps redundant skin fitting sealing that has a surfacing filler failure that has occurred....probably best to explore a bit more to make sure that if it is an old hull repair , the edges of the repair are structurally intact. As others suggest just prepare and use epoxy based surfacing fillers/coatings. Perhaps she has had the gel oat stripped at some stage and it is a failing fairing compound.
    www.seasurveys.co.uk
    Surveying & Shipwright info on GRP, WOOD & so much more

  8. #8
    Join Date
    Jan 2003
    Location
    Portland
    Posts
    1,549

    Default Re: hole in gel coat below waterline after jetwashing, best fix?

    If the core has taken up water you will need to allow it to dry out prior to sealing again.
    I used to be indecisive, but now I'm not so sure...

  9. #9
    Join Date
    Oct 2014
    Location
    Benfleet, Essex/Keswick, Cumbria
    Posts
    1,893

    Default Re: hole in gel coat below waterline after jetwashing, best fix?

    Quote Originally Posted by wizard View Post
    If the core has taken up water you will need to allow it to dry out prior to sealing again.
    Oh it will be dry, has been ashore for over a year now, and baking in the sun

  10. #10
    Join Date
    Apr 2019
    Location
    Wales
    Posts
    931

    Default Re: hole in gel coat below waterline after jetwashing, best fix?

    Quote Originally Posted by jwilson View Post
    It's gelcoat flaking off. Presumably not a newish or high value boat (not trying to be nasty). Scrape, prise off any loose edges, till it doesn't want to come off any more. Get as clean as you can then wipe with acetone, let dry (doesn't take long) then fill with epoxy filler (Plastic Padding do one). Milliput would not be my choice for this. Sand smoothish. Antifoul with the rest of the hull. Go sailing.
    That was surprisingly useful. (I.e. complete newb like myself understood).

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