Can you install tile over an existing tile or stone back splash? the answer is YES!
For situations where the stone or tile cannot be removed or that it would cause other problems, we can most of the time go right over it without scarifying the existing material but by using a product called Prim Grip by Mapei.
ECO Prim Grip is a ready-to-use, low-VOC, synthetic resin-based primer with bond-promoting silica aggregates suspended in a dispersion. It enhances the performance and adhesion of mortars to existing ceramics and difficult-to-bond-to substrates. Plus, it improves bonding of self-leveling underlayments (SLUs) and bonds of render coats over cementitious substrates. Suitable for a wide variety of substrates, ECO Prim Grip combines excellent versatility with an easy, low-odor application.
Here you can see an example of where we used the Prim Grip: