Heavily plasticized and fibered all rubber Polyprene for EPDM/PVC makes repairs and can't get brittle because it contains no bitumen or other vulnerable compounds. Versatile and easily installed where a seal is required on EPDM/PVC membranes. Works where different materials meet, requiring greater flexibility. Replaces ordinary asphaltic cement for all repairs with approximately 5x the strength and 10x the elongation. High solid content and very minimal shrinkage. Applies quickly and easily with a stiff brush, rubber glove, or trowel in one layer without threat of mud cracking. Ready to use with no mixing. Does not get brittle at cold temperature extremes. Use in conjunction with PolyCore™ reinforcing membrane where added reinforcement is needed.