Grout color changeing

[Dumbo]

I

Hi Mario, all,

With regards to Efflorescence - this is the migration of salts to the surface of the grout, which when the water evaporates leaves a whitish bloom.

Mapei Ultracolor Plus cannot itself produce this because we do not use Portland cement which can release the salts. This is not to say that this can never occur as Portland cement can be found in the adhesive or substrate but as before it cannot come from Ultracolor Plus grout.

The shade variation can be due to a polymer found at the surface which can be attributed to excess water, method or tooling of the joints. The higher the polymer content in the grout the higher the flexibility and water resistance. This can be removed by lightly rubbing with a fine sandpaper.

I hope that this helps! If you have any other queries, please do call Mapei's Technical Service Deparment 0121 5086970 (option 2), open 7am - 7pm week days

Kind regards,
Mapei UK Marketing

I just think that you should make grout which is less temperamental especially considering most tiles today are porcelain which don't draw any moisture from the grout therefore it is not hard to have excess water on the grout especially with slightly textured tiles on which Mapei ucp can be difficult to remove from to say the least.

 

[Flintstone]

I agree, it’s time grouts, all grouts were made to be more user friendly, and less chance of the problems mentioned above, shading, efflorescence, etc. Especially with greys.

 

[Blunt Tool]

Mapeis official stance above 🙄 tilers fault!

 

[Italy]

Mario does not say he used ucp.
he says mapei grout beige

 

[Simon Dale]

If you had a 1000mts Sandpaper lol

 

[Simon Dale]

Had similar problems with Keracoll grey all patchy, rep advised cleaning with their acid product did it, still looked the same ! Wots the best ?

 

[Italy]

Had similar problems with Keracoll grey all patchy, rep advised cleaning with their acid product did it, still looked the same ! Wots the best ?

kerakoll porcelana?
it's the norm ... I refuse to use it.

 

[Simon Dale]

I won't again !! I do like Mapei as it stays in the joint

 

[Simon Dale]

I tried Ardex the other day, first time since C2 impressed

 

[Dumbo]

I tried Ardex the other day, first time since C2 impressed

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