I’m trying to find a clear waterproof finish for a painted rendered wall, the render is on a 1850 year old property with stone walls and I need to bolster the water resistance. Do you have anything that can help?
Assuming the previously painted wall is clean, dry, sound and prepared as detailed in the Technical Data Sheet we can recommend Hydron Nu-Guard AG to increase the waterproof properties of the wall.
We would recommended testing for compatibility and adhesion prior to full application.
This will leave a light sheen to the surface.