Prepare the damaged area for Structo-Lite by scraping away any residual cured stucco. Hold the putty knife at a 15-degree angle to the surface of the wall and scrape the knife under any cured stucco affixed within the damaged area. Do not damage the wood or concrete under the stucco finish by scraping at too great an angle.
Pour the Structo-Lite into the wheelbarrow or mixing bin. Pour 3 gallons of water per 50-lb. bag of Structo-lite. Adjust the volume of water according to the actual poundage you use; most patching jobs do not require 50 lbs. of stucco.
Mix the water into the Structo-Lite with the plaster mixer. Add a small amount of water if the stucco is not completely saturated. Structo-Lite should not typically require more than 3.75 gallons of water per 50-lb. bag.
Scoop the Structo-Lite up with the trowel. Apply the stucco mix to the damaged area by slapping it onto the wall. Trowel the stucco with broad, even strokes. Attempt to match the pattern of the cured stucco surrounding the damaged area.