Can you recommend a reliable grout for porcelain stoneware for underfloor heating?

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The area is 140 square meters. I was planning to use CE 40 AQUASTATIC from Ceresit, but the reviews say that it crumbles and smears when wet cleaned. 

Answer

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I recommend Mapei Ultracolor.

Even though the instructions say that the product should be washed off after 40 minutes, it is better to do it 15-20 minutes after application. It hardens very quickly.

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