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Discuss Two issues with Mapei Ultracolour Plus grey grout in the Adhesive and Grout area at TilersForums. USA and UK Tiling Forum

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Hi,

I have recently grouted a bathroom with mapei ultracolour plus manhatten grey grout and have a couple of issues in places. It's the first time I've grouted.

Firstly, after roughly a week of use a few grout lines very near the shower appear to have lost small pieces of grout from the surface:
20190703_201742.jpg 20190703_201923.jpg 20190703_201848.jpg

Secondly, as soon as I had grouted I noticed some areas where the grout was very dark and have realised from searching online that this was probably due to excess water. I decided to just put up with it but I have now noticed that on the dark areas there are what look like drip marks where the colour has lightened:
20190703_202121.jpg


I am most worried about the first problem meaning that water will get in and behind the tiles, but any advice regarding either problem would be greatly appreciated, thank you.
 
OP
A
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Looks like it was too wet or had been remixed with more water once it started to set in the bucket.

Just my opinion.

Thanks.
I didn't add more water to it, but I did mix a second lot without completely cleaning the bucket so grout from the first lot could have got mixed back into the second lot.
 
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A bit of fine sand paper folded over to create a ‘sharp’ edge over the affected areas , just to remove the surface layer can often reveal a more consistent colour. Good luck
 
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Thank you both for your replies. I tried the sandpaper over the darker areas and it improved the appearance.

Since I last posted I'm now finding very dark patches appearing in areas that were a pretty consistent colour before. 20190713_085746.jpg

They remain hours after the shower has been used. I'm concerned I've made a terrible job of this and am going to have to rake out and re-do. Can anyone advise on this? Is it just caused by the same problem as before where too much water was used when mixing/cleaning? Or something else

Thanks you in advance.
 
H

hmtiling

Or better still (in my opinion) Universeal Grout rescue).

I've tried both and the Grout rescue is a far superior and more user friendly product. However, I would advise purchasing the pre cleaner too.
the pre cleaner won't be needed on brand new grout
 
H

hmtiling

That's what I thought a couple of weeks ago.

I spoke to one of their tech guys who told me to always use the cleaner even on new grout. Think of it as a primer he said.
I for one will always use it in future.
Sounds like a sales pitch to me. I've used fuga fresca and grout rescue on new grout and it takes very well. On old grout the pre cleaning is essential
 

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