Epoxy is a type of seal that creates a tough bond between many different materials. Epoxy can also be used to fix damaged stone steps that are chipped or broken. Epoxy works as both a filler and a glue to restore the steps to their original usability. Make sure to choose an epoxy that matches the colour of the original stone or the repaired areas will stick out like a sore thumb. This project takes some time to dry, but when complete, the steps will be as strong as they were when they were first manufactured and installed.
Clean the stone with denatured alcohol and old rags. Allow the alcohol to dry for 20 minutes. Brush away any loose stone with the soft-bristle brush. Break away any loose stones with the chisel.
Strip the stone down to the base stone if it has a seal placed over the surface of the stone such as wax. Pour the seal remover over the stone steps and allow to sit for 10 minutes. Use the putty knife to scrape away any of the seal from the stone steps. Clean any remaining seal by scrubbing with a nylon scrub pad and baking soda. Rinse the area with water when complete.
Mix the epoxy filler together, in a small bowl or other container. Add powdered pigments to die the epoxy to match the colour of the stone. Add enough pigments to make the epoxy slightly darker than the stone.
Apply the epoxy filler into any chipped areas. If an area of the steps completely broke off, use the epoxy as a glue to hold the two pieces together. Use the putty knife to spread the epoxy over the surface of the steps, feathering it out to the edges of the stone, or just until it smooths out to match the level of the surface of the stone. Allow the epoxy to dry for 24 hours.
Sand the epoxy until it is at the same height as the rest of the stone steps. Wipe the surface of the stone with a soft cloth to remove any dust or epoxy residue.
Apply some clear epoxy over the entire surface of the steps to create a tight seal that will hold the epoxy in place and prevent further damage from occurring over the surface of the stone. Apply the seal in a thin layer using a putty knife. Allow the epoxy to dry for 24 hours before using the steps.