Like marble or granite, slate is a natural stone product found in floors, counters and walls of homes to add a rustic and sophisticated look to the decor. Because natural stone is porous, it often attracts stains, and so most manufacturers recommend that you seal the slate in your home with stone sealant. If applied in the wrong place or at the wrong time, the sealant can discolour the slate and ruin the desired look. There are a number of steps you can take to remove accidentally applied sealer from slate.
Ventilate your work area by opening windows or running exhaust fans. You will use chemicals to remove the sealer from the slate, and these chemicals can produce strong fumes.
Repeat application of sealant stripper as necessary until the sealant is removed. Wash the slate in a stone cleaner to remove residual stripper, which will interfere with future sealing or cleaning if allowed to stay on the surface. Follow specific product instructions regarding application.