OB1 Sealant and Adhesive is a hybrid polymer formulation for the ultimate in sealing and bonding.. The Sealant does not contain any solvents so will never shrink or crack. It can be applied on painted, moulded or wet surfaces and it has a excellent bond strength with resistance to fungal and bacterial growth. A good alternative to mastics, wood and PU adhesives, silicones, acrylics and butyl rubber sealants.