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    Ready-to-use tile adhesives such as MAPEI's Type 1 and Premium Mortar for tile and stone require a porous substrate to cure properly. They should not be installed over a waterproofing membrane.
 
         
         
                 
                                Technical Services at 1-800-992-6273
Customer Service at 1-800-426-2734 (1-800-42-MAPEI)