The coating has been tested on most natural stone and adheres well. However, where the stone has been in long term use or has been sealed with another product, we cannot guarantee that our product will fully adhere to the stone or that the appearance of our product would not be affected. Moisture, silicon, oil, and wax etc., are not compatible with Sheerstone. In the case of bench tops there are a lot of chemicals that come into play such as cleaning materials, soaps, oils, shampoo, foods, and wines etc. Sealers often have oils, silicon, and other chemicals in them that can cause problems.
Grinding the surface and chemical washing usually solves these problems. However, testing the surface is often needed prior to application, and even then cannot guarantee adhesion.
As some of the chemical may have penetrated deep into the surface in some cases, it is impossible to know the coating will work until we have applied it. In extreme situations we may need to strip the coating to readdress the problem and then re-apply the Sheerstone.