Powdered plaster, mix-ins, and sample tiles from American Clay
This week I had the opportunity to try some plaster wall color from
American Clay. Their colored plasters are marketed as a natural alternative to traditional house paints (though writing “traditional” to refer to latex paint instead of plaster feels silly - colored plaster is what people rich enough to afford color on their walls used for most of civilized history).
The product is intriguing. I love the timeless, worn look of colored plaster, and I’m actively trying out as many non-poisonous wall-coloring products as possible. Colored plasters bypass the
off-gassing issues of conventional paint.
American Clay suggests that homeowners do not apply the products themselves but instead hire "artisans/applicators who have experience" using their products. Applying the sample colors to the tiles the company sent wasn’t hard - an imperfection is part of this look. But perusing the
reader questions on the American Clay website will help you decide if you have the patience and ability to do this job yourself.

The plaster comes dry; you mix it with water until it’s “the consistency of pudding” and then smooth it onto the wall with a trowel. It stays moist for a long time (hours, in my climate) so you can take your time applying the color and rework any mistakes. The tiles the company sent me to try the colors on were quite rough, which made it easy to adhere the appropriate thickness of plaster. I wondered if they’d stick to painted walls as well, so I tried the plaster out on my own walls (I then wiped it off with water - no permanent damage) and it wasn’t much harder to get the right coating on the wall. But the application process detailed on the company's website is more complicated than just smoothing on the plaster. Most walls will need a base coat of special sanded primer. And there are a variety of finishing techniques that the final coat can be treated with for many different looks.
I tried three styles of plaster, Porcelina, Loma, and Marittimo. They vary primarily in the fineness of their grain. The color range is limited, but beautiful. None of the colors are too clean (“clean” colors, without a variety of pigments, often look tinny and wrong, while colors with a variety of pigments in them change slightly in different lights and look much more natural). Any of American clay colors will look beautiful in a home.
The Porcelina finish plaster is fairly simple to apply oneself. It smoothed on easily, and settled into a lovely matte finish. But the thicker and chunkier Loma and Marittimo, because of their higher sand quantities, are harder to work with. They are thicker and rougher. Their look is also more specific. I wouldn’t put them in a home that wasn’t built of adobe. But the finer Porcelina plaster would look nice in any home, especially one with 14-foot ceilings in Italy.

The look of colored plaster is not equivalent to paint. It’s much less perfect. It’s rustic. The texture of any of these three finishes would be at home in an adobe-walled home in the Southwest, or in California. I’d also recommend any of the finishes for a home lacking significant architectural details. Plaster color can give a new home a feeling of substance and permanence. But if you live in an older home with molding, pieced doors, and Victorian or Arts and Crafts details, only the Porcelina finish would compliment your home. And then, you’d need to be careful to finish it quite smoothly.
American Clay also provided me with some straw and some mica to add to the plaster. I love the mica - it gives a nice sheen which would be lovely in a dark living room. The straw is a nice touch for historic renovations, where the look of horsehair plaster, or plaster with straw is sought. When I remodel an eighteenth-century tavern (let me dream, please), I’ll use this!
Finally, you should be aware that these finishes are not as durable as paint. If you dampen a rag to wipe crayon off the wall, the plaster rubs off with it. Apply only after your children have outgrown the need to color your walls.
Overall, I’d recommend the
Porcelina plaster by American Clay as a good substitute for conventional paint. You can
order a kit of samples to try out from the company website, and find someone who sells it, too. The finish is beautiful, and, if you have the time and inclination to do it yourself, application seems fun. And if you're building a new home in Taos, you need to hire a starving local artisan to apply this for you - your street cred depends upon it.