How to Marble Dust a Pool

Call your town's Building and Planning Department to ask about the proper procedure to empty your pool and follow the guidelines. The pool must be empty and dry before applying the marble dust.

Plan the marble dust project on a weekend or days when bright, sunny weather is forecast. This prevents unexpected rain from delaying the project or ruining your hard work before it dries thoroughly.

Wear safety goggles when removing the old plaster and cleaning off the old surface. This protects your eyes from flying debris.

Chip off the old plaster in your pool by using a jackhammer with the flat edge attachment. This breaks it apart from the gunite or concrete.

Remove all the old plaster by shoveling it into a wheelbarrow and disposing of it.

Wash the pool down with a garden sprayer filled with a mixture of muriatic acid and water. A 3:1 ratio of water to acid is sufficient to clean the pool area.

Remove the acid wash solution with an industrial sized mop. This ensures that the new marble dust adheres to the surface.

Rent a plaster mixer and position it near the edge of the pool. Combine the plaster cement and marble dust sand into the plaster mixer. The amount necessary depends on the size of your pool. The instructions on the plaster and marble dust tell you how many linear feet each bag covers.

Put on shoes with spikes and ask at least three assistants to do the same. It is important to work quickly while spreading the new marble dust mixture.

Turn on the plaster mixer and then pour the solution into the pool once it combines. Ask your helpers to spread the mixture over the surface of the pool with plaster trowels. Tell them to concentrate on filling any large voids or cracks.

Wait for the first layer of marble dust plaster to dry according to the directions. Another way to determine if it is dry enough is to toss a coin onto the surface. If the coin sticks, allow the surface to dry for another hour or two.

Apply a second coat of marble dust plaster to the pool surface. Do this in the same manner as the first layer. Once the second layer dries, apply a third and final layer.

Fill your pool with water once the final layer is dry.