Use the same color of plaster for the second coat. Holding the trowel at a 60- to 80-degree angle, apply another thin layer of plaster. Use overlapping (X-shaped) long and short strokes. Cover the surface thoroughly, filling voids and removing high spots. Let the plaster dry for at least a full day before moving on to the finish treatment.

Most of the do-it-yourself products that I have seen do not discuss applying any more than two coats, perhaps because they don't want to make the process sound any more involved than it is. But additional coats can be useful. Each new layer makes the surface stronger, and by varying your technique with the trowel from one coat to another, you can create even more interesting effects. Just be sure to keep each coat thin.

Finishing Touches

The final steps involve burnishing or polishing the surface, and perhaps applying a topcoat. The topcoat will add durability to the surface, and is particularly recommended in rooms with high moisture (such as bathrooms) and high traffic. If you decide to use a topcoat, however, be sure to choose a product that is specifically recommended for the brand of plaster that you used. Also be sure to use it as directed on the label. Some manufacturers suggest that you burnish before applying their topcoat, others say to follow the reverse order.

Burnishing can be accomplished by rubbing the surface with very fine sandpaper (400 or 600 grit). Use a circular motion while sanding, and then clean the surface with a damp cloth. You can create a more polished look by rubbing the surface with the flat side of a clean trowel or putty knife.

The topcoat is usually applied with a trowel soon after the plaster has dried. You should expect that the topcoat will darken the color a bit. Once dry, you can burnish the surface with the flat side of a clean trowel or putty knife.

You can also create a good sheen and add protection to the surface by using paste wax for the topcoat. That's what Doug did in the kitchen of the San Diego home shown in the photograph. He applied a thin coat of wax with his trowel, and then burnished the surface by rubbing it with the side of the trowel. Again, it's best to experiment with your materials and techniques on sample boards before going to work on your walls and ceilings.