Why do we may need to waterproof exterior walls? Many of the materials we use to make exterior walls, such as stone, brick or concrete, among others, are porous, which allows water to seep in and cause stains on them. One solution to avoid these seeps in is to waterproof these walls made with porous materials. But in many cases, as in the beautiful stone wall of the house we see in the photo, we will want to maintain its appearance. So in this case we cannot use a waterproofing paint. Therefore, the best solution for waterproofing this stone facade is to use an invisible waterproofing product that penetrates into the pores sealing them, but does not form any type of layer on the material (like it does waterproofing paint).
In this case I am going to use Xylazel Solutions Invisible Water Sealant, a waterproofing product that can be applied on porous materials and will not form a layer on this beautiful stone, so it will not change its nice appearance. This product is easy to apply and penetrates very well into the porous surface of the exterior wall. But if we do want to change the appearance of the porous surface of this exterior wall and give it a satin look, we can apply a waterproofing varnish. Both are water repellent products that will prevent water from penetrating into the pores of the stone facade.
Although the video shows the use of the waterproofing product using a simple brush on this large wall that has a large surface, it is also possible to apply the invisible waterproofing with a roller or spray gun. Before applying this waterproofing product to this exterior wall I have to clean the surface. In most cases it is enough to use a brush to remove the dust. I apply a coat of transparent waterproofing product to the exterior stone wall, I let it penetrate the pores of the wall and then a second coat is applied.