Amazing, it does exactly what it says, it doesn't leave any stains. I have applied it all over the balcony and the exterior walls that get wet.

Simply perfect, I applied it on a marble surface where the grout was missing, and nothing passed through underneath on the balcony

Amazing material. It does exactly what it says. It doesn't create crust and fully waterproofs the marble, without leaving any stains or darkening the marble. In the picture, someone can see where the material was used and where it wasn't. The only thing I don't know is how long the waterproofing will last.