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Unread 01-20-2015, 02:59 PM   #1
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Grout Caulk a wet area no-no?

I was lurking some old threads here in light of a customer who had used polyblend grout caulk at the base of a tub and after 3 days it began to soften again. . I noticed on an old thread someone had the same issue, and said custom told him its not actually okay to use that near somewhere that is exposed to repeat moisture.

A little confused becuae wouldnt that include sinks (which is featured on the bottle as a great spot to use this stuff). Is silicone just a better option in most/all cases? A little help for my soul
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Unread 01-20-2015, 04:28 PM   #2
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100% silicone is almost always the better way to go. Keep away from the caulks in most cases.
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Unread 01-20-2015, 05:27 PM   #3
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Acrylic and "siliconized acrylics" are not rated for continuously wet environments. They tend to break down with such exposure. Technically, it could be used for a portion of some vertical corners, but the bottom horizontal corners at the base of the shower or tub are typically exposed to continuously wet conditions. Yes, the surface of the tile dries between uses, but the tile assembly typically gets moisture inside and continuously exposes the backside of the caulk to moisture.

I will nearly always use a 100% silicone sealant in wet areas. And it's much more flexible than the acrylic caulks, so it's less prone to ugly cracking.

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Unread 01-22-2015, 06:15 PM   #4
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thanks dudes. I will keep that in mind when advising folks out here. I had no idea!
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