Bostik® 70-03A, also known as ISR 70-03, is a high-performance silyl modified polymer (SMP) sealant engineered for demanding bonding and sealing applications across construction, marine, transportation, and industrial manufacturing. Its advanced hybrid technology offers strong primerless adhesion and long-term flexibility.
High-strength SMP sealant for industrial and construction applications
Excellent adhesion to metals, plastics, composites, and coated surfaces
Flexible, durable bond that withstands movement, vibration, and weathering
Solvent-free, isocyanate-free, and low-VOC formulation
UV-resistant and weather-resistant for long-lasting outdoor performance
Paintable after curing to match surrounding surfaces
Bostik® 70-03A / ISR 70-03 is designed for applications requiring strong, elastic sealing performance combined with professional bonding strength. Its silyl modified polymer chemistry provides primerless adhesion to many common substrates, including aluminum, coated metals, fiberglass, plastics, composites, and glass. Ideal for transportation assembly, marine construction, automotive bodywork, building components, façade systems, RV fabrication, and industrial sealing tasks, this versatile sealant cures to a tough yet flexible elastomer that resists UV exposure, moisture, chemicals, and temperature cycling. With low odor, easy tooling, and a non-shrinking formulation, Bostik® 70-03A ensures clean, durable, and long-lasting results in both interior and exterior environments.
