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  1. #1
    Moderator Jen's Avatar
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    Default Gib-board bubbling under paint sealer/ plaster

    Hiya all,

    As PF1 members are a wealth of knowledge, I thought I would ask here for advice. My kitchen has just been ripped out and there was damage to the wall board - from tiles being removed, previous poor plasterboard surface from wallpaper removal and fresh holes from the electrician. I got a gib-board repairer/plasterer in to fix the wall, but he only had the one day to do so, so I agreed to do the final sanding after the kitchen was in.

    However, I can see in places the gib-board outer paper lining has lifted from the plaster board, resulting in small bubbles. What is the best way of fixing these? I did think to sand it back with fine sandpaper, refill the area and then sand smooth before undercoating - is this OK? I didn't want to end up making a mess of the wall in my attempts to fix it.

    In hindsight, I should have had the walls ripped back to framing and new gib-board installed, but the time frames were tight.

    Cheers.
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    Last edited by Jen; 04-03-2014 at 03:38 PM.

  2. #2
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    Default Re: Gib-board bubbling under paint sealer/ plaster

    There will be better answers but I'd be inclined to use a VERY sharp knife - say a box cutter. Carefully slice the paper off so that you get to the plaster below. If it is all OK there, sand the edge of the hole you have made, fill the hole with a good Polyfilla or the like. Wait a day or so until it has fully cured and dried. Then sand using a sanding block under your sand paper to get a good flat finish. If there are imperfections, use the Polyfilla again. Paint with a sealer then undercoat and to do a good job, two top coats.

  3. #3
    Soaring like an Eagle gary67's Avatar
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    Default Re: Gib-board bubbling under paint sealer/ plaster

    Mainly as Bryan says but use a good fine surface filler or even Gib+4 if you can get a small enough quantity. Don't skimp on the quality of the filler it makes a huge difference

  4. #4
    Frank and Earnest. Cicero's Avatar
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    Default Re: Gib-board bubbling under paint sealer/ plaster

    I would ask the plasterer.
    "The life of the dead is placed in the memory of the living." Cicero

  5. #5
    Moderator Jen's Avatar
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    Default Re: Gib-board bubbling under paint sealer/ plaster

    Thanks for the advice. Now I've got lights back on in the kitchen I can see the bubbling occurs in several spots over a 1.2 m wide area. I have decided it would be easier to make my glass splash back 1.4 m wide, thereby covering up the dodgy stuff.

  6. #6
    Frank and Earnest. Cicero's Avatar
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    Default Re: Gib-board bubbling under paint sealer/ plaster

    Glass is a nice splash board.
    "The life of the dead is placed in the memory of the living." Cicero

  7. #7
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    Default Re: Gib-board bubbling under paint sealer/ plaster

    I don't want to scare you but what made the bubbles occur? Nothing nasty behind the board is there? Anyway, the splash back will cover it all nicely.

  8. #8
    Moderator Jen's Avatar
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    Default Re: Gib-board bubbling under paint sealer/ plaster

    The bubbles are from the very top layer of the gib-board paper, separating from the other paper layers. You can push down on the bubbles and flatten them (temporarily). This would have occurred when removing the wallpaper backing by spraying it with water and then scraping it off. As the wall board surface was damaged, the water only made the paper lift. I also suspect the thin layer of wet plaster also made the dodgy areas worse.

    I asked a company about a glass splash back today, and said I wanted it mechanically fixed to the wall rather than gluing it on. I didn't want to replace wall board again if I had to remove the glass in the future. The guy looked at me as if I was nuts. He said I was the first person to ask this. I thought it was a reasonable request as mirrors can be mounted in a top & bottom J-molding.

  9. #9
    Frank and Earnest. Cicero's Avatar
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    Default Re: Gib-board bubbling under paint sealer/ plaster

    "The life of the dead is placed in the memory of the living." Cicero

  10. #10
    Moderator Jen's Avatar
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    Default Re: Gib-board bubbling under paint sealer/ plaster

    Thanks for the link. As mentioned in the link, it is easy to have a bold colour and swap it out in 5 years or so if you grow sick of it.

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