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Unread 01-20-2015, 05:27 PM   #3
Tool Guy - Kg
Moderator -- Wisconsin Kitchen & Bath Remodeler
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Join Date: Feb 2005
Location: Oak Creek, WI
Posts: 23,338
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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