Crystic BP 91-21PA is a pre-accelerated isophthalic polyester bonding paste. It exhibits exceptional mechanical and water resistance properties, and gives structures high shear-strength. Bonding paste 91-21PA has been specifically designed for the assembly and bonding of GRP moulding such as panels, inserts, internal frames, ribs, internal core materials, hull to deck assemblies, composite constructions and car body components. No resin additions are required.