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Old 11-17-2010, 07:47 PM   #16
Davestone
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I did a job one time with Mapei grout.It was summer and after it dried it turned yellow.So yellow in fact i thought it was pollen which we get a lot of sometimes.I tried to wipe it off and it wouldn't come off.I freaked and got out the vinegar and a brush and it took it right off.It never happened since and i have no idea why or what it was.
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Old 11-18-2010, 12:13 AM   #17
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i had a grout supplier tell me today ALL epoxy grour goes yello if in sunlight
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Old 11-18-2010, 10:32 AM   #18
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It does make sense that it would yellow, that's what epoxy does. If it was a darker color, the yellowing would just darken it more, which probably wouldn't be objectionable.
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Old 11-18-2010, 10:48 AM   #19
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Hopefully I am not hijacking the thread

I am a little scared now. I am working on a bathroom which has a skylight.

I have not grouted yet, but already purchased spectralock bright white!

Should I be concerned (it is too late for that I guess)?
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Old 11-18-2010, 05:35 PM   #20
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If it were true that all epoxy yellows, then I think the whole shower would yellow. If you take a close look a the first picture you can see that it goes from "Bright White" at the top where the water doesn't hit it, to "yellow" where the water hits it a little lower. My aunt is the home owner, so she offered to do the soft scrub with bleach (thank god, I don't want to get Popeye arm this week). I will let you know if it works or not. If not it looks like I might have to Picasso it with the grout colorant.
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Old 11-18-2010, 06:27 PM   #21
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I had a white grout turn yellow in a shower and outside walls.Never found a reason and bleach,which did turn it white again..didn't last.I ended up using silver Aquamix grout colorant and 3 years later the joints still looks the same.
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Old 12-06-2010, 11:06 AM   #22
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Any updates to this thread? I'm about to use Custom's white epoxy grout in my bathroom.
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Old 12-06-2010, 11:26 AM   #23
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Warren,

I don't know if CB epoxy has been around long enough for the pro's to voice an opinion.
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Old 12-06-2010, 12:10 PM   #24
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Paul,

Thanks. Any comments on other brands? Is epoxy yellowing a thing of the past?
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Old 07-31-2012, 11:05 PM   #25
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Same experience

I had my bathroom remodeled several months ago, and the licensed contractor used SpectraLock in bright white. I have experienced the exact same problem mentioned here. Additionally, the grout stains easily. No cleaning product or method I've used seems to work, both on the yellowing and the stains. I am not sure what to do. I cannot call the contractor. After they blotched the quartz countertop, it was clear that they were not going to take responsibility for any thing else that went wrong.
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Old 07-31-2012, 11:21 PM   #26
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Wow, old thread.

I had the same problem with some white Mapei Kerapoxy I installed a few years ago. The customer wasn't upset about it, so it was a non issue.

If it had become an issue, I really dont know what I would have done about it

Did some more white epoxy a couple years later and fore-warned the customer about the issue I had. Did the job... no issues. Again
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Old 10-29-2012, 07:55 PM   #27
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I have exactly the same issue with specra lock Ultra white, I have tried everything including acid cleaners etc, nothing seems to help
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Old 03-05-2013, 03:03 PM   #28
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Just a thought which may be very obvious:
Could it be that the water has iron in it and the yellowing is actually rust?
Are there any other areas in the house with discoloured fixtures, like toilets or sinks?
Can you get a sample of the water from the house and have it tested at a lab for iron content?
We used to see this in old houses when I was a kid and the pipes and fixtures were all made with cheap steel.
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Old 03-05-2013, 03:04 PM   #29
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Does this mean I should change my mind and not use Spectralock in the shower I am about to tile?
Jim
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Old 03-05-2013, 05:08 PM   #30
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Try cleaning with diluted bleach or hydrogen peroxide and warm water.
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