I’m hoping you get an answer to this as I am interested in it as well. I started looking into it last year but there were no certified installers close to us at that time, the nearest one was 100+ miles away. I spoke with them anyway but did not move forward after a few conversations because it seemed it would be a very expensive proposition and we had other/bigger projects to tackle first. Since our finish was painted over plaster (by previous owners) I was told that if we wanted to do this they would have a local company come sandblast the finish and apply plaster, then they would come and apply the Aquabright. So while the idea of a non reactive finish that lasts a very long time is super interesting to us, we just could not sink that much $$ into the project. We decided to just repaint to get a few more years of use and keep hoping that in the meantime, more info and reviews become available and at least one or 2 places more local to us become certified and start offering the product.