As a result of the casting procedure, air becomes entrapped within the Supercast mix and on the surface of the molding material. Supercast uses a high cement to water mix ratio; this creates a very thick, dense composition making it difficult for trapped air to escape. Thorough processes are incorporated into the casting process in order to minimize the number of pits visible on a finished Supercast piece. Plasticizer additives are used in the Supercast composition in order to create a more fluid mixture without increasing the percentage of water, as water decreases the strength of the composition. Agitation of the piece is also performed during the process to allow trapped air to escape.
While the composition and casting process is designed to allow air bubbles to escape, surface tension on the surfaces of the piece prevent a small percentage of smaller air pockets from releasing. The pitting is an inherent component of casting Supercast. The presence of pitting does not compromise the durability or strength of the piece but adds to the distinctive look.