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Unread 08-28-2012, 10:08 PM   #1
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Installing Corner shelf

I am in the process of re-doing my bath and am installing an 8" flat marble corner shelf (3/4 in thick - no backing flange). I notched the tile to accommodate the shelf, covered the back of the shelf with 100% GE clear bath and kitchen silicone, and pressed into place (against Hardi). Also put a few wedges to hold it in place. Came back 48 hours later, removed the wedges, and found the shelf to have movement. Was able to pull the shelf out and found the silicone still partially wet. Hesitant to use silicone again, would thinset or onmi grip be better?
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Unread 08-28-2012, 11:05 PM   #2
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Thinset, yes.
Omni grip.......No! Mastic is not suitable for a wet area.
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Unread 08-29-2012, 05:21 AM   #3
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The silicone or mastic won't dry like a powder mixed thinset.

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Unread 08-29-2012, 05:44 AM   #4
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Check the expiration date on the tube of silicone...

GE hasn't remained perfectly constant throughout the years, so I say this with some hesitation. But GE silicone is a neutral curing silicone and WILL NOT HARDEN if it's expired material. Unlike acid curing silicones that simply get hard in the tube when they expire, neutral curing silicone does not.

Did you check the expiration date on the tube?

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