Sand the surface of the faux brick wall using a sanding buffer with a medium-grain sanding ring. This will remove any roughness or uneven texture.
Vacuum the faux brick wall and surrounding area using a shop vacuum to remove any dust or debris caused by the sanding.
Spread a 1-inch-thick layer of fine grout stucco onto the surface of the wall using a triangular trowel. Allow the trowel to create creases and indention marks as you apply the grout stucco.
Allow the stucco wall to air dry for 12 to 18 hours.
Spray a layer of latex wall sealant over the stucco wall, then allow the sealant to dry for 12 to 18 hours.