Apply burnt sienna paint to the entire surface as a base coat. Use a paintbrush for corners and edging and a paint roller for large areas like walls. Let the base coat dry overnight.
Crinkle up a cheesecloth and lightly dip it in the pewter metallic glaze. The cheesecloth should only have a light coating of glaze on it.
Blot at the surface lightly and randomly, working in a diagonal direction to cover the entire base coat with a textured pattern. Let the glaze dry.
Dampen a natural sea sponge with water. Dab the sea sponge into the dark brown glaze until the sponge is evenly coated.
Use a light, brisk dabbing motion to apply the dark brown glaze around the pewter areas. Lightly layer the dark brown glaze to make the finish look more aged. Let the finish dry overnight.