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DIY Backsplash: How to Update Your Kitchen in a Flash

Finish with Grout

After letting your tiles set for 24 hours in the mastic or thinset, you’re ready to grout. Mix the grout with water according to the instructions on the bag, and use a grout float to spread it over your tiles and fill in the spaces between them. Then use a damp sponge to wipe off any excess grout and let the backsplash dry before buffing with a dry cloth to make your new backsplash shiny and bright.