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Yes, however keep in mind that compressive strengths will be reduced when using aggregates. Aggregates should be selected based on weight considerations/appearance. Aggregates sized greater than 10 mesh should not be used, as the gypsum crystals will not bond well to them. Reinforcing materials can be used for thin casts. Glass mat and chopped glass can add flexural strength, and very small fibers can add chip resistance to castings.