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Discuss Grouting going off colour in the Tiling Forum area at TilersForums.co.uk.

  1. Sam K

    Sam K Active Member

    Location:
    St Albans
    I have grouted a floor using the BAL Smoke grey however it is not coming out that colour and is very patchy. Some bits are light grey and some are dark. It has also happened to me before. I am using a fresh clean bucket, added water and stirred with my hand with a glove on to get the right consistency, however don't know why I'm getting this reaction. Any suggestions? I have attached photos

    IMG-20180731-WA0036.jpg IMG-20180731-WA0034.jpg IMG-20180731-WA0035.jpg
     
  2. Plan Tec Tiling

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

    Location:
    Wimborne, Dorset
    Are you saying you actually mix with your hand!? :confused:
     
  3. 3_fall

    3_fall Administrator. Staff Member Trusted Advisor Professional Tiler JOTM Winner Top Contributor

    Location:
    SW London
    Grey grouts are notorious for drying patchy nowadays.
    You should empty the contents of the bag in to a dry clean bucket first and dry mix the grout.
    This will ensure that the pigments are evenly mixed throughout the grout first, then mechanically mix the grout with a small paddle.
    This will be especially true if you’re not mixing the entire bag all at once, and you should make sure that mixes are identical, proportional to the amount of water used.

    Another reason a grout will dry patchy is because of efflorescence. (Excess water at some point) the grout dries too slowly and salts are drawn up thro the grout because of the slow rate of moisture release.
    That can be caused by standing water already in the joints when you grout, or using excess water when washing off.

    It does appear tho in this case tho that you’ve just not mixed the grout thoroughly enough and the pigments are not evenly distributed throughout the grout mix.

    One other reason it can happen is if you try and ‘top up’ already drying or dry grout.
     
  4. antonio

    antonio Trusted Advisor Professional Tiler JOTM Winner Top Contributor

    Location:
    italy
    I mix dry in a separate bucket, then I put it in the water.
     
    • Agree Agree x 1
  5. 3_fall

    3_fall Administrator. Staff Member Trusted Advisor Professional Tiler JOTM Winner Top Contributor

    Location:
    SW London
    :):tractor::thumbsup:
     
  6. antonio

    antonio Trusted Advisor Professional Tiler JOTM Winner Top Contributor

    Location:
    italy
    tractor?
    you are copying me too much.....:(
     
    • Funny Funny x 1
  7. jimthetiler

    jimthetiler Active Member

    It is good practice to leave the grout to rest after mixing for a couple of mins then remix.
     
  8. Localtiler

    Localtiler Trusted Advisor Professional Tiler JOTM Winner

    Location:
    Yorkshire
    I don’t think that’s an issue with the pigments not mixed right, I think that’s a problem with over washing or washing too soon, or both.
     
  9. antonio

    antonio Trusted Advisor Professional Tiler JOTM Winner Top Contributor

    Location:
    italy
    sorry marc,
    I had not noticed that you had already said.
    for me in the morning English is mixed with Italian and dialect...:mad:
     
    • Like Like x 1
  10. Localtiler

    Localtiler Trusted Advisor Professional Tiler JOTM Winner

    Location:
    Yorkshire
    Antonio, that’s not just in the mornings mate ! :p
     
    • Agree Agree x 1
  11. antonio

    antonio Trusted Advisor Professional Tiler JOTM Winner Top Contributor

    Location:
    italy
    I always hope to gain the English accent.
    I do not give up
     
    • Winner Winner x 2
    • Funny Funny x 1
  12. 3_fall

    3_fall Administrator. Staff Member Trusted Advisor Professional Tiler JOTM Winner Top Contributor

    Location:
    SW London
    Well the reason I would say it’s not efflorescence is because a symptoms is that the grout is lightened in appearance, not darkened.
    As the original colour is smoke grey, which I believe to be quite a light shade, you wouldn’t be getting the dark shades If it was suffering from salt deposits.
     
  13. Localtiler

    Localtiler Trusted Advisor Professional Tiler JOTM Winner

    Location:
    Yorkshire
    Ahh, I’m not familiar with smoke grey so not sure what colour it’s sipposed to be but those really light almost white patches must be efflorescence
     
  14. Tom Astley

    Tom Astley Professional Tiler

    Location:
    Manchester
    I always try and 'peg' the grout joints with these new grey grouts and that seems to stop any shading issues. If the joints are narrow like these, then I would just let the grout firm up a lot and then rub the grout joint with a fluffy towel. That works too.
     
    • Agree Agree x 1
  15. ttt tiling

    ttt tiling Professional Tiler

    Location:
    brackley
    One swipe with a sponge and that's it
    No more washing till next day
    Find it a git to use but mapei always seems to dry consistently
     
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