DIY German Schmear Fireplace Makeover for under $70! . Materials: - thinset mortar - grout sponge - putty knife - grout piping bag . 1. Mix your mortar according to the instructions. The goal is peanut butter-like consistency. (If you flip your putty knife over it should stay there) 2. Pipe the grout lines with the mortar 3. Take your wet sponge and wipe the brick. Add / wipe mortar as needed to get desired coverage 4. Let it dry and that’s it. It’ll lighten as it dries so don’t be alarmed by th