Grey grout dried different shade

[stusgsx]

Hi all, I have finished a wet room last week and just had a call saying one of the walls the grout is lighter.
Ive not been and looked yet but one wall I did was grouted using half a bag I had in van and the rest with a new bag. All was Bal Superflex grey so could this be because it's a different batch and I have just been lucky in the past?
Bit annoyed as the job went so well :-(

 

[nybor62]

how old was the part bag , or had it got damp

 

[Ian]

I'd say that's probably the problem, 2 different batches. I know it's a bit late now but, I alway mix the powder together if I've got 2 batches. A recolour will fix it though mate, fairly inexpensive.

 

[stusgsx]

The part bag was only a week old and I tape them up too :-(
Yeah I'm thinking must be batch difference and I've just been lucky in the past. Oh well I know now!
When you say re colour how do you mean? Go over the different wall with the correct batch?

 

[stusgsx]

Just been and looked at the job and on 2 of the walls and floor the grout looks almost white! Not sure what's gone on tbh. What causes frost flouresent ? Could it be that?

 

[Colour Republic]

Has it dried a different uniform colour or has it dried patchy?

 

[Andy Allen]

im finding bal grouts a bit of a pain just latley for drying patchy, mainly the grey super flex and the limestone, im thinking of switching to weber..

 

[stusgsx]

It's pretty much all gone a shade of white. Not patchy. I've read up about it and could be too much water when wiping down but I only gave it 1 wipe as I knew I was coming back so could clean it better then. Also could be from it being too cold which would make sense as there's no heating there or moisture from behind escaping but it's on to cement board and tiles were up for at least 24 hours. I grouted over part of one wall and will see how that drys but I want to know what's caused it

 

[John Benton]

im finding bal grouts a bit of a pain just latley for drying patchy, mainly the grey super flex and the limestone, im thinking of switching to weber..

I've not used BAL for a long time but did use the limestone last week, due to matching up with tile colour and found it dried very even in colour.

 

[charlie1]

I think the whole bag needs to mixed at once as this is only way to ensure the colour has mixed properly, some grout its the actually the cement that is coloured so you can mix a small bit at a time, others need to be whole bag.

 

[charlie1]

im finding bal grouts a bit of a pain just latley for drying patchy, mainly the grey super flex and the limestone, im thinking of switching to weber..

try mapei Andy, you never get this problem however it can be slightly messy stuff to work with

 

[stusgsx]

I re grouted one of the walls but it hasn't dried as dark as the wall that came out how it should but it's better than it was. What is the solution to this? Could this just be a dodgy bag that dried a lot lighter? Raking the whole lot out will be near impossible without damaging anything If I go in there and start colouring in the grout then the customer is going to think I'm lashing it!

 

[charlie1]

Coloring it is your best option regardless of what the customer will think.

 

[DHTiling]

It is just polymers on the surface of the grout , use a grout residue remover and scrub the joints, this should loosen the polymer residues and bring back the colour..