A method for preparing swimming pool plaster includes the addition of titanium dioxide (TiO2) to white swimming pool plaster mixture to improve the appearance of the plaster and reduce or eliminate mottling. Approximately two pounds of TiO2 is added per sack of cement. For example, approximately ten pounds of TiO2 may be added to a 5/7 bag mix of cement and pool sand. The TiO2 is added to water in a mixer in a first step, and the TiO2 and water are mixed dissolving the TiO2 in the water before adding cement or pool sand, thereby providing better mixing of all of the ingredients.