To evaluate the moisture sensitivity of polyester and acrylic polymer concretes with commercial metallic monomer powders, polymer concretes containing different levels of these powders were investigated with respect to the properties of hardened polymer concrete. The mix design was made and optimized for workability, strength, and economy, which depended on the resin viscosity, the intended use, and the additional quantities of the polymeric materials. The investigated properties included the compressive and flexural strengths of hardened polymer concrete. These polymeric materials offer the possibility of using wet aggregates in polyester and acrylic polymer concrete construction. (C) 2007 Wiley Periodicals, Inc.