Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 4 of 4

Thread: Plaster Coloration-Any plaster expert in the house?

  1. Back To Top    #1

    Join Date
    Sep 2008
    Location
    Northern CA
    Posts
    5

    Plaster Coloration-Any plaster expert in the house?

    Our pool is just under a year old. The plaster is a "medium Tahoe blue", meaning it is grey. Took some pics with an underwater camera today and had a couple of questions:
    there's a lot of mottling of the color throughout the plaster. Is this hydration staining or just an artifact of the color they put into the plaster? We like it...it gives the pool bottom and sides some interesting textures throughout the day...but wondering if this is normal.
    Second picture is the eggshell cracking appearance of the steepest wall at the deepend of the pool. This eggshell phenomenon is only apparent on this one long wall, and there's no crack, per se...if you run your hand over the plaster, its smooth...but it has this odd eggshell cracking pattern that I don't understand.
    Anyone out there an expert on plaster issues?
    Looking forward to anyone's thoughts....
    Thanks.
    Attached Images Attached Images
    Northern CA
    IG gunite/plaster, completed 1/09; 22 x 40, 8 ft. deep; Hayward pumps; waterfall; diving rock

  2. Back To Top    #2
    Guest

    Re: Plaster Coloration-Any plaster expert in the house?

    Might be the pictures, but it appears that you have some copper sulfite damage in there (purple discoloration). Did you use a copper algaecide by any chance? Also looks like some hard water (scale) build up. What is your calcium hardness level at?

    The checking/crazing is normal, and somewhat to be expected. Happens more often in hotter climates (was your pool plastered during hot weather?), but is a part of plaster.

    Here's a cut from the National Plasterers Council guidelines: "Since plaster finishes are composed of natural materials which have certain inherent characteristics, a certain amount of shading or color variation is a natural occurrence which should not be construed as a defect. The shade and color variation may vary and fade over time. The plaster finishes may become streaked, blotchy, or have a mottled appearance. Crazing (check cracks and hairline cracks) may be noticeable and may be quite pronounced with pool finishes other than white plaster".

    Bruce

  3. Back To Top    #3

    Join Date
    Sep 2008
    Location
    Northern CA
    Posts
    5

    Re: Plaster Coloration-Any plaster expert in the house?

    Thanks for the reply and information, Bruce.

    No copper has been used - that purple tone is an artifact of scaling down the pictures to a size that will fit here on the board.
    There's no hint of purple in the pool or at the tile line.
    Northern CA
    IG gunite/plaster, completed 1/09; 22 x 40, 8 ft. deep; Hayward pumps; waterfall; diving rock

  4. Back To Top    #4
    frustratedpoolmom's Avatar
    Join Date
    May 2007
    Location
    SWSuburban Chicago, IL
    Posts
    11,963

    Re: Plaster Coloration-Any plaster expert in the house?

    Using a photo host site like PHotobucket.com might work better for you for attaching pics. (Select the "large" size when uploading to their site.)
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •