I'm a tiler based in the south east, i do a lot of natural stone floor cleaning, stripping and resealing, and i have just started doing grout recoloring as a lot of people don't want to re tile there bathrooms or floors they just want them smartened up, this is a special coating that goes straight onto the grout that makes it waterproof, so i can make a dirty tiled floor look brand new again but at a fraction of the cost plus i can change the color of the grout. Would this service be any good to any of you guys?