Model-Pro Casting' Resin Gallon Kit Polyurethane System Casting resin for Making models, molds, protoypes, figurines, proof molds, make reproductions, etc.. Model-Pro turns from liquid to solid in 15 minutes and works excellent in rtv silicone molds Model-Pro is a two component polyurethane casting resin which exhibits good impact resistane and strength. Same Day Shipping This is a 1 Gallon Kit containing 8 pounds. You will recieve 1/2 Gallon of Side "A" and 1/2 Gallon of Side "B"