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Thread: Can I paint over plaster ?

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    Can I paint over plaster ?

    My 3 years old plaster pool is fading its color. I've had it plastered with Diamond Brite Midnight Blue. Replastering is out of question , it would take to much money to import the product back, and I am thinking to just paint it ? Is it an insane idea ?
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    10,000 glns bean shaped inground plaster pool - Pentair SD60 sand filter - Pentair 3/4 HP pump

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    JasonLion's Avatar
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    Re: Can I paint over plaster ?

    Maybe not all the way to insane, but not really such a good idea. Paint only lasts a couple of years and then needs to be sand blasted off and repainted.

    If your diamond brite is fading you probably have calcium scaling, since diamond brite doesn't fade. You might be able to do a no drain acid wash to reduce the amount of scaling and get the color back.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: Can I paint over plaster ?

    I surely had calcium scaling and only recently (got wise thanks to tfp) adjusted my CH level that was previously pretty much zero having used rainy water to fill up the pool.
    How do I do a no drain acid wash ?
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    JasonLion's Avatar
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    Re: Can I paint over plaster ?

    The idea is to lower your PH, TA, and CH levels enough that you start dissolving calcium off the walls and floor of the pool. If you have a pool heater it is important to either completely disconnect the heater or keep PH above 6.8 while doing this. Also, you don't normally want to swim when the PH is below 7.2. If you do this, you need to carefully monitor the process. You don't want it going to far. At the same time, it can take quite a while to have the desired effect.

    To figure out how much you need to lower PH, TA, and CH you can use the Pool Calculator to calculate your CSI. You want to lower them enough that CSI goes down to between -1.3 and -1.0. As the scale on the pool dissolves into the water PH, TA, and CH levels will come up, so ongoing effort is required to keep them low enough.

    The alternative is to do a full drain acid wash, which means draining all the water out, and manually washing the pool surface with muriatic acid to dissolve the scale. This is much faster but also far more work and requires some skill to apply the acid uniformly enough that the proper look is achieved and nothing is damaged. This approach is best when the scaling is not uniform to begin with. Manual applicaiton of acid allows you to remove more scale from areas that require it and less from other areas.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    solarboy's Avatar
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    Re: Can I paint over plaster ?

    Full drain acid wash not for the feint hearted. This week I was wiping 33% MA on some glass tiles and getting some fierce fumes wafting around.
    Self built 5500 gallon bare concrete (temporarily) pool with limestone coping, Pentair Swimmey 1/2 HP pump, Triton sand filter with DE, Simpool peristaltic muriatic acid pump with pH sensor and Monarch SWG. Home made solar heater with Pentair Compool control panel and 3 way valve. 1 skimmer, 1 main drain, 2 returns, 2" plumbing, Hayward auto fill valve.

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    Re: Can I paint over plaster ?

    Quote Originally Posted by solarboy
    Full drain acid wash not for the feint hearted. This week I was wiping 33% MA on some glass tiles and getting some fierce fumes wafting around.
    There are specially formulated muriatic acids that are much safer to use for acid cleaning. The fumes are greatly reduced.
    http://www.wmbarr.com/product.aspx?catid=99&prodid=206

    http://www.certol.com/AcidMagicHome.aspx

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    solarboy's Avatar
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    Re: Can I paint over plaster ?

    Thanks for the links James
    Self built 5500 gallon bare concrete (temporarily) pool with limestone coping, Pentair Swimmey 1/2 HP pump, Triton sand filter with DE, Simpool peristaltic muriatic acid pump with pH sensor and Monarch SWG. Home made solar heater with Pentair Compool control panel and 3 way valve. 1 skimmer, 1 main drain, 2 returns, 2" plumbing, Hayward auto fill valve.

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    Re: Can I paint over plaster ?

    Quote Originally Posted by JamesW
    Quote Originally Posted by solarboy
    Full drain acid wash not for the feint hearted. This week I was wiping 33% MA on some glass tiles and getting some fierce fumes wafting around.
    There are specially formulated muriatic acids that are much safer to use for acid cleaning. The fumes are greatly reduced.
    http://www.wmbarr.com/product.aspx?catid=99&prodid=206

    http://www.certol.com/AcidMagicHome.aspx
    They also don't work nearly as well.
    20X40 30,000 gallon gunite pool

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