Dark patches in limestone grout

[enduro]

You may have mixed it correctly, but was i cleaned off with to much water, to quickly? were the joints totally clean of adhesive before grouting?

 

[DHTiling]

It was left to set for about a week before I got round to grouting.

And how big a tile and how deep was the adhesive bed.?

 

[kaharrison9]

I replied on the other thread with this same problem i've experienced 3 times now with Bal superflex limestone.
I have followed the instructions exactly as said previously.
To add to my earlier comments i've used this grout on porcelain,ceramic and slate.
The drying time of adhesive has been 2 days,1 week and a regrout that was tiled one year later.
The substrate has been plaster and hardiebacker.
Quite a wide array but have had this problem every time.
Trying a differant brand next time.
Should have contacted Bal but assumed as nobody else had really mentioned it somehow i was at fault
Kev

 

[Perry]

bal grout used to always darken when the moisture comes out when the wrong adhesive ie bucket or to deep and or the substrate is non porous or gets wet ete

 

[basshunter]

bal grip?