Stucco is a common exterior finish applied to buildings for a long time. There are various degree of texture shown depending upon the builder’s intention and/or skill. In the past, I have used 600 grit sandpaper with and been unhappy with the results. My friend, Jimmy Booth, mentioned a technique he had developed many years ago for application over wood surfaces. I decided to give it a try. I will let you be the judge of the finished product.
Here is my completed wall of the Pleasaton gas station. The wall has some texture but still maintains a relatively uniform surface finish. It is not at it’s final color. One more coat of the final color and I should be good to go.
The technique and materials are simple and easily found. I use a Tamiya flat acrylic paint diluted with their airbrush thinner. To this solution I add aluminum oxide blasting grit. I purchased it from Paasche for grit blasting models. The object is to create a slurry grit suspended in paint. Do’t add too much since we don’t want to make a paste.
I mix the stucco up on a small jar and use an old brush to dab it on. I will sometimes put a few drops of thinner on the surface to allow the grit to flow. Applying over a primed surface is better than plain styrene. I have done both and like the primed surface better. I use Tamiya spray primer in a rattlecan.
The stucco mix was applied directly over smooth styrene in this view. The finish is a fragile so handle with care once applied. That also means you can sand it to soften the effect or even redo it. The view below shows the effect over a primed surface.
Here is a closup of the painted stucco wall.
I am satisfied with the results.