C.R. LAURENCE 960806323 CRL White Tremco DyMonic FC Polyurethane Sealant. CRL Tremcor DyMonicr FC is a fast skinning, high performance, low modulus, one-component, moisture curing, polyurethane sealant. DyMonicr FC features a smooth, consistent surface when cured. It requires no priming when used on most common substrates, provided surfaces are dry, clean, and free from contaminants. It is supplied in a non-sag consistency which will gun easily with conventional caulking equipment. Because it skins in only one hour at 70 F (21 C) there is less dirt pick up compared to other polyurethane sealants. Regular DyMonic typical skin time is 16 hours at 70 F (21 C).. Part Numbers Variations: 960806323