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EZ~Sprayï¿½ 45 is a polyurethane rubber for spraying through the EZ~Sprayï¿½ Junior Cartridge System. EZ~Sprayï¿½ 45 can be sprayed onto vertical surfaces for making molds or is good for making fast molds of large surface areas. After a suitable thickness is attained, EZ~Sprayï¿½ 45 cures overnight with negligible shrinkage to a durable mold rubber. Application of a support shell is achieved by spraying Smooth-On's EZ~Sprayï¿½ Plastic over the rubber mold after it has fully cured. EZ~Sprayï¿½ 45 is suitable for casting a variety of materials including wax, gypsum, urethane/ epoxy resins, concrete, etc. Yield - Each cartridge contains 3.75lbs. (1.7 kgs.) of material. Assuming a thickness of 3/8in. (0.95 cm), one cartridge of EZ~Sprayï¿½ 45 will cover approximately 1.875 sq. ft. (0.17 square meters).