Mapei ECO Prim Grip Primer, Wally and Floora Say:

Wally says:
How strong is the Mapei ECO Prim Grip Primer? It's so strong, that it can hold tile over existing tile. It's stronger than the jaws of a Great White shark or stronger than the bond between a mother and child.
Okay, my lawyer just texted me that I am only allowed to say that Mapei ECO Prim Grip Primer is strong enough to hold tile over tile, stone, existing ceramics and other difficult-to-bond substrates. Using latex technology, this tile primer will save you time, money and effort when installing a tile or stone surface -- whether you are a contractor, property management company or a DIY-er tackling a fixer upper project.

Floora says:
If you watch home improvement shows, wishing for someone to come and replace your outdated tile and stone fixtures, you'll be happy to know that you can update any space without a major renovation. Once Mapei ECO Prim Grip Primer is applied, new tile can be installed over old, existing surfaces within 15-60 minutes. Yes, you can install new tile or stone in less than an hour.