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  1. #1
    Join Date
    Aug 2013
    Location
    SW Leicestershire
    Posts
    1,169

    Default How to remove epoxy from inside hull.

    The in-hull transducer fitted to my boat leaked so after endless unsuccessful attempts to seal it up with Captain whatsits creeping crevice cure and marine sealant I finally solved the problem with Marine Epoxy filler. Problem is I now need to remove the transducer housing to replace it with a new one and I want to use that position because I know it works. I presume the inside of the hull is covered with flowcoat rather than gelcoat but I'm concerned in chipping off the epoxy I might inadvertently remove chunks of layup. The best way I can think of although very slow (and with suitable face mask) is to grind it off with a Dremel and then make good/smooth with gelcoat filler.
    Better way?

  2. #2
    Join Date
    Nov 2013
    Location
    Perth WA
    Posts
    2,440

    Default Re: How to remove epoxy from inside hull.

    I think the only way to get the epoxy off is to sand it in some way. Are you really going to damage the inside of the hull? If I thought I had I'd epoxy a few layers of glass cloth where I thought I'd done the damage.

    I used flowcoat once and I would never use it again. It is expensive and I don't think it does anything that RustGuard (or Killrust) epoxy paint. The Saleswoman at Bunnings put me onto it when she said "you can buy the same paint in the Marine Section at double the cost"
    Last edited by coopec; 15-11-19 at 10:19.

  3. #3
    Join Date
    Oct 2018
    Location
    A Member State of the European Union
    Posts
    7,618

    Default Re: How to remove epoxy from inside hull.

    Rather than have dust everywhere and in my lungs, I would take it off with a mallet and a sharp chisel. A few moments work.

    Any collateral damage to the hull lay-up can easily be made good with epoxy.

    If that doesn't appeal, an oscillating multitool such as Fein, Bosch etc. sell with a saw blade fitted would be quicker and less messy than abrading it off.

    https://www.toolstation.com/bauker-3...SABEgK_4fD_BwE
    "Brexit: like watching a library being burned down by people who can't read"

  4. #4
    Join Date
    Feb 2013
    Posts
    2,180

    Default Re: How to remove epoxy from inside hull.

    I tried to remove epoxy from bedding in an in hull depth transducer with a sharp chisel and it came away with about 10mm of the hull layup. I then had to build up the hull thickness so I would go with sanding down with an angle or finger grinder. Glue the new one down with something less adhering than epoxy! I used a polysuphide sealant for the new transducer and it is fine.

  5. #5
    Join Date
    Aug 2013
    Location
    SW Leicestershire
    Posts
    1,169

    Default Re: How to remove epoxy from inside hull.

    Like the idea of the oscillating multitool but will try with various cutting and grinding tools on the Dremel first. Yes entirely agree about the risk from airborne fibres - will make sure I'm using the right type of mask.

  6. #6
    Join Date
    Mar 2017
    Location
    Me; Nth County Dublin, Boat;Malahide
    Posts
    906

    Default Re: How to remove epoxy from inside hull.

    Quote Originally Posted by eddystone View Post
    Like the idea of the oscillating multitool but will try with various cutting and grinding tools on the Dremel first. Yes entirely agree about the risk from airborne fibres - will make sure I'm using the right type of mask.
    IMHO an angle grinder would be better as the job would be finished quicker, resulting in less lungfuls of dust.

  7. #7
    Join Date
    Oct 2001
    Location
    Surrey & boat in Dorset. Both have pubs
    Posts
    3,844

    Default Re: How to remove epoxy from inside hull.

    Quote Originally Posted by eddystone View Post
    Like the idea of the oscillating multitool but will try with various cutting and grinding tools on the Dremel first. Yes entirely agree about the risk from airborne fibres - will make sure I'm using the right type of mask.
    I try and have my garage vacuum cleaner 'running' sucking up any dust that I create. Some of the multitools have the fittings to attach vacuum clean hoses, etc. I also site, if possible, my vacuum outside the boat in case dust gets through the filter.

  8. #8
    Join Date
    Dec 2013
    Location
    Deale, MD, USA
    Posts
    1,861

    Default Re: How to remove epoxy from inside hull.

    Vacuum attachment. Every boater should have them, not just for you, but to reduce boatyard dust. And run a second vacuum if you like. Should only take moments.

  9. #9
    Join Date
    Sep 2001
    Location
    Home - Sothampton, Boat - Gosport
    Posts
    10,677

    Default Re: How to remove epoxy from inside hull.

    Quote Originally Posted by Spirit (of Glenans) View Post
    IMHO an angle grinder would be better as the job would be finished quicker, resulting in less lungfuls of dust.
    I disagree. An angle grinder is a wonderful weapon of mass destruction, while being capable of delicate work in the right hands but, because of the speed of the disc, dust goes everywhere. The multitool doesn't project dust in the same way.

    If there's any sort of finish - gelcoat, flowcoat or paint - on the inside of the hull, the very strong likelihood is that the finish will lift from the layup without a problem apart from the need to make good afterwards, but the worst case scenario is that you'll need to epoxy a bit of mat down. If it does come down to that, you'll find more than you'll ever need to know about how to do it here: https://www.westsystem.com/instruction-2/
    Steve
    Never believe anything until it has been officially denied.

  10. #10
    Join Date
    Feb 2017
    Location
    Largs
    Posts
    13

    Default Re: How to remove epoxy from inside hull.

    I was told by a boat builder to use a hot air gun and a scraper, tried it and it does work !

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