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A lot of the grout I've used over the years recommend mixing and applying it all at once. If you don't, you should use exactly the same parts water to grout every time you mix it. They say if you don't mix it exactly the same, the color could be slightly lighter or darker.

I've always grouted everything with one batch so I don't know how noticeable it would be.
 

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the grout may look slightly different in different batchs due to the amount of liquid added as well as the humidity levels during the drying time. This is not a good way to do it.
 

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What they said...but...

I HAD to grout my bathroom shower and floor in stages and couldn't do it at once. I was very careful to mix the grout the same consistency by measuring the water the first time and repeating. If you know where to look you can see slight variations in the grout, but with our floor tile, you don't notice, there's way more color variation in the tile than the grout (tumbled travertine).

If you decide to grout in stages...one thing you'll want to to is at every grout line, take a small brush and clean out the last little bit of grout. When you pack the grout in, obviously you work from the surface of the tile an push the grout into the line. Where the grout ends, the top will be full, the bottom will not. If you don't clean that small distance thats not full of grout, eventually it will fail. The best thing I found to clean the grout line out is the pointy end of a denture brush. It gets right into the crack, and with a slight pull you can take the grout back to where it's fully packed, which is where you'll stop. So from the side, the grout fill will look like this / if the line were being filled from the right to the left. Hope that makes sense...
 

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Discussion Starter #5
Thanks everyone for your help.

The room that I will be doing is large and I thought that maybe I could do it a little at a time, but it sounds like I should just do it all at once.

I will have to just tell everyone that mummy is not available........lol

Rippyskippy, your explanation does make sense.
 
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