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Old 03-02-2011, 09:11 PM   #1
specs.
Cliff Harris
 
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Does POLYBLEND Grout Require Sealing ???

Hey Fellas,

Hope all is well. Looking for some clarification please:

As I understand it, polyblend grout need not be sealed. I'm using Mapei Kerabond sanded in a shower and master bath. Today the Super on the job inquired about sealing the grout. I advised him it wasn't required. Tonight for grins, checked out Mapei's take...here:

http://www.mapei.us/pdf/TechBulletin...ning_TB_EA.pdf

...and they say it's (paraphrase) "while it's not required, it's certainly helpful...."

Curious to know if I advised him correctly, and the grout, without sealing, will perform to standards, reasonable usage witheld.

Thanks YO !!!

C
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Old 03-02-2011, 09:15 PM   #2
Tool Guy - Kg
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Yes, Polyblend sure could use sealer.

It doesn't have any of the magical sealing properties like what Grout Boost is supposed to give.

And a quickie question: Polyblend is a Custom brand product. Why the link to Mapei's grout cleaning page?
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Old 03-02-2011, 09:23 PM   #3
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Sorry, wrong choice of words. Meant it has "polymers. It's Mapei Kerabond. I was told that sealing grouts that contained polymers wasn't required. That's my question.
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Old 03-02-2011, 09:34 PM   #4
eurob
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Cliff,

Kerabond is a thinset , not a grout.

Here is the Grout/TDS 129 for the Polyblend.

Polyblend
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Old 03-02-2011, 09:42 PM   #5
Tool Guy - Kg
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So you chose the wrong words and it's definitely not Polyblend. Okay, but it's not Kerabond either....'cause like Roberto says, that's a thinset.

And just because grout has polymers in it doesn't mean it doesn't need sealing. But you need to get very specific on exactly which grout is in question. Not all grouts, even cementitious based grouts are treated the same when it comes to sealing them.

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Old 03-03-2011, 09:35 AM   #6
Steve Taylor
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Polymer in grout will reduce the water absorption, but it does not protect from staining. The ANSI specification for a polymer modified grout still has a water absorption of 5-7%. Who's ever grout, if it is cement based and polymer modified it should still be sealed once it has cured, usually 72 hours.
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