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Thread: blistering on fiberglass

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    blistering on fiberglass

    Anyone ever had blistering/bubbles on bottom of fiberglass pool? I googled this problem and apparently the surface needs a new coat of gel every 17-20 years?!? What the? Never thought this would be an issue. Pool existed when moved in, I believe it was built @ 1995. Not sure. Any suggestions? How do I go about repairs? Does bracing need to take place before draining? Please help I am sick about this situation?

  2. Back To Top    #2

    Join Date
    May 2007
    South Central NJ

    Re: blistering on fiberglass

    You understand correctly, for the most part. If the blister is small, it may be possible to grind it out, fill it and repaint and coat as a patch. It will show slightly but to not do anything will cause the situation to get worse.

    Owner of - PoolGuyNJ LLC
    Expert Pool and Spa Repairs, Renovations, and Augmentation. Helping people decide what is the right gear for meeting their needs. Expectations Set, Expectations Met, No Surprises.

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    Re: blistering on fiberglass

    Thanks Scott...will the whole surface need to be redone eventually? If so should I have it done while the pool is drained to prevent future issues? The area is about 16 inches long and about 5 inches wide, unfortunately in the deep end. If I have the whole thing done over then I should be good for a while and maybe there wont be a color difference??? I am really nervous to drain and worrying about shifting or cracking. I am considering waiting to next season since I will be closing in the next few weeks. I won't need to put any closing chemicals in since I will be disposing of water, right? Thanks for any further input.

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    Join Date
    Aug 2009
    North Central Texas

    Re: blistering on fiberglass

    After 7.5 years, never empty, my spa developed a few bubbles this spring (I don't know why) so I'm going to be watching this thread.

    General questions though. Will this in pool or spa cause any damage to the fiberglass underneath? Or will leaks become a problem?

    Thanks, gg=alice
    1981, 25K, IG, Blue Plaster 1996, somewhat oval, widens a bit at shallow end, 1.5" pipes, 2" at Pad, 1 separate main drain, 1 skimmer, 4 returns + dedicated cleaner return, 10 ft deep end with very fast decline from shallow, Pentair Quad 80 DE, Pentair Intelliflo VF, 3/4 HP Booster Pump (equipment pad about 8 ft below top of pool), Challanger 3/4 Trash/Emergency Pump 120v, Polaris 280 (pressure), iRobot Verro cleaner (robotic), Aquabot Turbo (robotic), Jacuzzi Tracker 4X (vacuum) Pool Blaster (Buster), Two (2) PoolSkims, Solar Breeze (solar powered top skimmer) (beta to ver. 2, release date 2010), ColorSplash LED replacement bulb. Aries 550 gal separate spa, 2002 (our 3rd and BEST spa) , BBB-Bromine

  5. Back To Top    #5

    Re: blistering on fiberglass

    hey granny,
    from what i understand the gel coat is what keeps the surface from becoming porous--once bubbles appear that means the coating in worn and alge can set in the "uncoated" area. i think you are in o.k shape if you only fix that small spot. you are less likely to see it after repair and it is much easier to repair that a pool. i don't believe it damage fiberglass or make leaks more prone to happen. good luck.

  6. Back To Top    #6

    Re: blistering on fiberglass

    Any one have any more comments? Getting ready to close for the winter and don't want this over my head all winter. Who would do the procedure a pool company or the manufacture? At a loss...please help.

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