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Discuss SOS! I need help! My Black grout is gray! in the Adhesive and Grout Forum area at TilersForums.co.uk.

  1. Josh Clark

    Josh Clark New to TilersForums.co.uk

    Location:
    Erie, Pa
    OK, I need some constructive instruction. I did a polished slate floor in herringbone, and wanted Black grout to accent the colors in the floor. Well I’m having problems with efflorescence/gray grout. I know I really screwed up by using to much water to clean the tile, I don’t know how I could have avoided it tho. The tiles are 3”X12” and the amount of cleaning was unavoidable. I have done black grout before this and did not have this problem. I used Mapei un-sanded grout.

    I’m not a fan of how the Mapei grout refresh looks or feels, so I’m not a big fan of that solution. And using an acid to clean the grout with not work with the natural stone. So what can I do to fix this with out completely removing all my grout, which I do not want to do(because I would have to polish and reseal the tile before grout again)? Do I have any other options?
     
  2. impish

    impish Trusted Advisor Professional Tiler Top Contributor

    Location:
    Preston, Lancs
    First try warm water and a nail brush to scrub off any surface salts. Let it dry and in nine out of ten cases it'll fix it.
    Failing that, you could use a water based sealer such as universeal stone sealer which will enhance the grout without over enhancing the stone.
    Acid cleaner is a really bad idea as you'll just completely ruin the grout.
     
    • Like Like x 1
  3. impish

    impish Trusted Advisor Professional Tiler Top Contributor

    Location:
    Preston, Lancs
    Even olive oil, brushed into the grout will work, but not forever (if you know what I mean!)
     
    • Like Like x 1
  4. Josh Clark

    Josh Clark New to TilersForums.co.uk

    Location:
    Erie, Pa
    So the sealer being water based will help. Because I did forget to mention that I did try using a sealer/impregnator on a spot that would be under the vanity but it just went gray after it dried.
     
  5. Josh Clark

    Josh Clark New to TilersForums.co.uk

    Location:
    Erie, Pa
    And this is for my personal bathroom so I would like a permanent fix. The olive oil doesn’t really sound like a good idea, I’m going to be sealing the floor again and don’t want to have this problem After.
     
  6. Andy Allen

    Andy Allen Metro specialist & forum entertainer! Trusted Advisor Professional Tiler JOTM Winner

    Location:
    Gloucester
    Use a grout colourant.
     
  7. Plan Tec Tiling

    Plan Tec Tiling Administrator Staff Member Trusted Advisor Professional Tiler JOTM Winner Top Contributor

    Location:
    Wimborne, Dorset
    As @Andy Allen@Andy Allen says, something like Mapei Fuga Fresca will work or try a stone friendly cement residue/ efflouresence remover. I keep a non acid based cleaner on the van for this very problem
     
  8. Protiler 68

    Protiler 68 Professional Tiler

    Location:
    South east/kent
    Hard to get a blck grout ,where this doesnt happen ,even a little bit
     
  9. bsc ceramics

    bsc ceramics Brent Professional Tiler

    Iv used a black colourant before from universeal sealants. I was impressed with it.
     
  10. Bopster

    Bopster Active Member

    Location:
    Colchester
    I’ve just used Bal ebony on black quartz tiles and after reading about it being a pain for this reason. As it happened I wasn’t bad at all, I didn’t use much water when cleaning and had no issues after buffed up the tiles.
    I would try grout colourant though in this case as heard go things about it
     
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