Sure-Weld® TPO and Sure-Flex™ PVC Universal Corners Carlisle SynTec Systems February 16, 2017 No Comments Carlisle SynTec Systems’ new pre-molded, seamless Sure-Weld TPO and Sure-Flex PVC Universal Corners are made of injection-molded, 60-mil non-reinforced flashing and are ideal for flashing corners on a variety of details.Read More