How to Stamp Concrete Vertically
- 1). Clean the concrete surface completely with a brush and water. Remove broken or chipped mortar. Allow to dry thoroughly.
- 2). Apply the bonding agent primer. If using a bulk powdered primer, mix according to package directions. Paint the edges with a paintbrush and the center using a roller with a thick-napped roller cover.
- 3). Mix mortar according to manufacturer's directions on the mortar package. Apply a scratch coat of mortar mix to the entire surface with a mason's trowel 1/8-inch thick on the entire surface. Use a mason's rake to scratch the surface of the mortar.
- 4). Mix the vertical stamp substrate according to manufacturer's directions. Work in 4- to 6-foot sections to apply a 1- to 3-inch coat of vertical stamp mix to the surface with a mason's trowel. Apply one section ahead, and stamp the previous section.
- 5). Work the vertical stamp substrate according to the type of impression desired. Create individual stones by sculpting out grout lines and pressing the texture stamp firmly against the vertical surface.
- 6). Apply concrete colorant by hand on the individual stones, or spray with colorant in a pressure canister sprayer to color the entire wall. Colorant does not need to be used, but will add a more realistic impression to the stamped vertical surface.
- 7). Seal with a high-quality sealant after the wall has dried for at least a week. Apply with a brush or pressure canister sprayer.
Source...