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  1. #1

    Unhappy Repeating cracks in the bottom of the hull

    What do you all think about this? Anyone experienced with recurring hull cracking?

    The last two years (the length of time we've owned the 2000 moomba mobius V - we bought it used) we have been having issues with cracking near the lowest point at the bottom of the boat - right below where the ski locker ends and the fuel tank begins. (We believe the previous owner sold us the boat in this condition without disclosing the problem as it looked like it had been patched the first time we tried to have the crack fixed) The crack is a V shape that spread up the boat but is less than a few inches long on each side.

    We had a fiberglass person patch it twice now which involves removing the fuel tank and patching it inside and outside, and both times over the summer the crack has started to appear again. The second time we had it patched the inside patch held, but it still started to crack again. He is recommending he re-fiberglass the length of the boat on the bottom figuring that there is just too much flexing going on between the hull layers and a smaller sized patch isn't enough. It is going to be a rather large sum of money, and I'm only willing to commit if it will solve our problem permanently.

    Below are 3 images, one that just shows our boat looking all nice, and the other 2 pics are of each side of the bottom of the boat showing the crack as it creeps up the hull. Again, the location is right below where the ski locker ends and the fuel tank begins.

    2000 Mobius V

  2. #2
    Join Date
    Jun 2007
    Vancouver, WA


    Remind us - how many hours on this hull?

    I'm curious about how much stress your boat sees - running w/ front ballast slammed? lots of rough water? what kind of supports it sits on in the lift? Basically anything that could cause a lot of stress/load in specific areas resulting in the cracks starting and spreading. Did the cracks start when it lived on the trailer or just since it's been in the lift?
    The years have been kind, it's the weekends that have done the damage.

    2001 MobiusV - Loaded with Ballast, Exile, Blood, Sweat & Tears

  3. #3
    Join Date
    Jan 2008
    Tallahassee, FL


    Did the previous owner keep it in the water all season? Or on a lift?
    My Mom said I'm not allowed to get wet!
    2008 LSV
    2000 Outback LS (sold)
    Exile Tunes
    P5 Danielo Diamond 58"

  4. #4


    The previous owner trailered it. We use it on a lake that is usually relatively calm and smaller in size. We have no fat sac in the bow, but we do have an 1100 one in the ski locker. We noticed cracking before we had any ballast system installed. It sits on a shore station with two bunks that run lengthwise.

    The only time we fill the center sac pretty full is when we surf. We have a 750 that we fill next to the engine and a 400 that sits on the seats for additional weight in the rear.
    2000 Mobius V

  5. #5
    Join Date
    Jul 2011
    Central Wisconsin


    Boat has about ~620 hours on it. This has been extremely frustrating for us as it has now delayed us getting into the water for 2 years and it still is not fixed...We have already put a bunch of money into this fix and it just keeps happening.
    2000 Mobius V
    Monster Tower MT2 - 750 rears, GG 1180 center - PP Wakeboard Edition

  6. #6
    Join Date
    Jan 2008
    Pensacola, FL


    Do you have issues with the window closing properly? Are there any other indications that the hull is flexing too much?

    Gel coat is very stiff and is prone to crack. There are different epoxies that can be used in fiberglass to allow flex or be rigid. Just a thought, that the repair was made with the wrong epoxy and is causing this.

    I would get another opinion from a different fiberglass shop.
    1997 MasterCraft 205

    2008 Moomba Outback
    1999 MasterCraft Sportstar OB
    1992 MasterCraft 205
    1999 Malibu Response LX
    1987 Marlin Magnum Skier

  7. #7
    Join Date
    Aug 2011

    Default Re: Repeating cracks in the bottom of the hull

    Those are tiny.. Why are you so worried? It sucks that it happened but nothing you can so about it now. Here's what I found on my last boat, got it cheap and in the dark...

    That's about 16inches long, the guy hit something very hard at full speed. My point is yours isn't that bad..keep an eye on it but nothing to worry about, definitely get it insured incase it sinks...I wouldn't mention this thread with the insurance folks..

    Sent from my Nexus 4 using Tapatalk 2
    Attached Images Attached Images
    2002 Moomba Mobius LSV - Sold
    2006 Moomba Mobius LSV

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