Masonry Paint / Problem

Discussion in 'Painters' Talk' started by ChrisChris, Mar 20, 2022.

  1. ChrisChris

    ChrisChris New Member

    Hi just wondering if anyone could advise me on the following problem....

    Cement sill running across the house was damaged and was patched up. It has had numerous coats of Sandtex masonry paint over it but I’m still getting show through at various points. It gets painted the marks disappear and then reappear

    Thanks
     

    Attached Files:

  2. Astramax

    Astramax Super Member

    Looks like Efflorescence, try neutralizing the crystals area with White Vinegar.
     
  3. ChrisChris

    ChrisChris New Member

    Thanks Astramax I’ll give it a go
     
  4. Astramax

    Astramax Super Member

    @ChrisChris, commercial Efflorescence treatments are also available.
     
  5. ChrisChris

    ChrisChris New Member

  6. Astramax

    Astramax Super Member

    Efflor-treat has good reviews, try the white vinegar though, start with a 50/50 with water ratio, stronger if required, brush on and leave for 15 mins wash off and repeat if needed.
     

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