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Unread 02-08-2005, 08:55 PM   #9
Union Tile Setter--Green Bay, WI
michaelhazuka's Avatar
Join Date: Jan 2005
Location: Green Bay, WI
Posts: 897
it looks like mastic to me..check to see if the residue resembles a dried, caulk-like substance...I'll put money that the installer used mastic to install the shelf.

Bad, very bad. Clean the shelf off and re-install using a thinset.
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