Formula 21 products are formulated with Pliogrip Adhesives, which are used many OEM’s in their manufacturing processes. Panel Adhesive for door skins has a 35 minute work time and may be sanded / sanded painted in 3 hours. 7.3 fl oz. Includes two GTMN mixing nozzles. Application also requires GTSU 2-Part Universal Applicator Gun or equivalent. Applications: Door Skins and SMC Panels Non-Structural