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Old 02-17-2010, 06:52 AM   #1
sheldonl
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Join Date: Feb 2010
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Black grout has turned grey

Hi,

I'm looking for some advice to a problem. This was the first time I've applied a colored grout, my only other experience was doing the bathroom shower tile. (Which came out great.)

Last night I tiled black granite with Polyblend #60 Charcoal Nonsanded Grout. When I woke up this morning most of the grout was a lighter grey color, but there are some patches where the grout is black (but not many.) I mixed the grout with a mortar mixer on the end of my drill so I know it was well mixed. After I applied it with the float I noticed that in many places it wasn't so smooth so I used a damp sponge and water on my finger to smooth out the grout after I filled it in. (Was this a no-no? What have I done wrong and how can I fix it?

Thanks!
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Old 02-17-2010, 09:35 AM   #2
bbcamp
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Typically, lighter grout means too much water used during cleanup. Sounds like you've already confessed to the crime.

Most cases, the grout color underneath the surface is correct, so you just have to remove some of the surface material. Use vinegar and a stiff nylon brush, scrub the grout until you see a change of color, then rinse off with clean water. It may take a couple or more scrubbings to get the right color.
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Old 02-17-2010, 10:20 AM   #3
sheldonl
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Thanks for the reply.

Yes, guilty as charged! I'll try scrape off the surface layer.

If I scrape some off, is it ok to apply another thin layer of grout on top?

Thanks again!
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Old 02-17-2010, 10:23 AM   #4
bbcamp
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You won't need to do that. The amount of grout you need to remove is about 1 grain of sand thick. Maybe 2 grains. It won't be noticeable.

If you really need to re-grout, remove grout down to 1/3 of the tile thickness.
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Old 02-17-2010, 04:39 PM   #5
JC
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Or just use a grout colorant/sealer in a black and wipe on wipe off while the grout is still unstained and porous. Might match closer then the charcoal too.
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