Venetian plaster is a modern term that describes an ancient method of applying a stuccoed surface coating for walls. Venetian plaster (sometimes known as lime plaster) is essentially a putty made from fired limestone or marble dust mixed with water. As the surface is burnished after application, it develops a finish that has the look of genuine marble.
Traditionally, a Venetian plaster surface achieved its effect through the use of unique materials applied by a skilled craftsman. Fortunately, newer products have made it possible for do-it-yourselfers to create similar results in just a few steps and with no special training. Even better, today’s products contain acrylic polymers that produce a more durable and long-lasting surface. With Venetian plaster, you get what you pay for in terms of quality. Bargain products are little more than thick paint, but the best Venetian plaster contains genuine marble dust mixed into an acrylic base.
You can find Venetian plaster in home centers and paint stores. It is sold in one-gallon cans, just like paint. Some products are sold already tinted, while others require that you or your dealer add universal colorants to achieve the color you want. The latter approach offers far more color choices.
One of the nice things about applying Venetian plaster is that you really do not need to buy many tools and materials to handle the job. The most basic Venetian plaster finish requires only a steel trowel and the plaster material. New drywall requires a preliminary coat of primer or flat wall paint, so you may also need an array of basic painting supplies.
Source: The Spruce