Repairing a Hole
Chisel out crumbling stucco with a hammer and mason's chisel. Be sure to wear goggles for protection.
Snip out any damaged wire lathe base. Vacuum out any loose debris. Replace the old wire lathe with new wire lathe by positioning a piece into place and securing. Not all stucco facades will require this step.
Adhere the premixed stucco with a steel trowel, pressing the mix onto the base wall. This is referred to as the scratch coat. Let the scratch coat to sit for 30 minutes, then scratch the surface with the edge of the trowel to a depth of 1/8 inch.
Allow the scratch coat to set for 24 hours, spraying with a mister every four hours.
Adhere the second coat, referred to as a brown coat, with the trowel. Level the brown coat smooth with the straight edge of a small section of wood board, sliding the board back and forth and upward across the brown coat. Smooth the patch further with a sponge. Spray the patch with a mister every four hours for two days.
Mix together 2.5 parts masonry cement, 3.5 parts sand and the necessary amount of water in a wheelbarrow to make the final coat. Consistency should resemble that of a soft, creamy butter. Mix the final coat with dry pigments to match the color of the old stucco. Dampen the brown coat with a spray mister before brushing on the final coat to a thickness of 1/8 inch.
Use the edge of the trowel to match the texture and pattern of the new stucco with the old stucco.