Bostik 70-03A Adhesive/Sealant is a one component, Silyl Modified Polymer that is used for bonding and sealing metal frames, welded seams, floors, sunroofs, and elastic construction joints in the transportation industry. It is fast curing, solvent free, odorless, requires no primer, and resistant to UV and aging. 290 mL Cartridge. Bostik 70-03A is designed for making elastic construction joints that require high strength: Elastic bonding and sealing for these markets: bus, caravan, train and truck construction.