To mix stucco, make the dash coat, mix the scratch coat, mix the brown coat, and mix the finish coat. You need cement, mineral oxide pigment, water, hydrated lime and sand to complete the project.
To mix a dash coat, place one part cement in a mixing basin, add two parts sand, use a trowel to mix the ingredients, add water and mix into a desired texture. The mix helps a scratch coat adhere to walls properly.
Mixing a scratch coat involves placing one part cement, about 3 parts sand, 1/4 part hydrated lime and water in a basin and mixing the ingredients to form a slurry mixture. Apply the coat to a thickness of about 1/2 inch to the surface of wall, covering the lath fully.
Add enough water to a basin that contains one part cement, 1/4 part hydrated lime and five parts sand, and mix well to form a brown coat. Apply the coat to a thickness of 3/8 inch to prepare for the application of the finish coat.
To mix the finish coat, put one part cement, five parts sand, 1/4 part hydrated lime and mineral oxide pigment in a mixing basin, and add an adequate amount of water before stirring. Be sure to use at most 10 pounds mineral oxide pigment for every bag of cement, and sieve sand first to remove small stones.