Bostik ISR 70-03A Gray SMP Adhesive Sealant

Description

Bostik 70-03A is a gray SMP adhesive and sealant for transportation, fabrication, and industrial panel bonding work. It is used where bus, truck, caravan, train, and trailer assemblies need an elastic bond line that can seal welded seams, roofs, floors, sunroofs, and aluminum or polyester corner profiles.

Bostik 70-03A Benefits

• SMP chemistry gives crews a one-component adhesive sealant with no mixing step at the bench.
• Elastic cured bead helps manage movement in vehicle panels, roofs, welded seams, and floor systems.
• Solvent-free, isocyanate-free, and PVC-free formulation supports cleaner handling than many older urethane options.
• Paint compatibility after skin forming helps finish teams keep assembly and coating work moving.
• Gray color fits visible seams and panel joints where a neutral bead is preferred.

This grade is a fit when the joint needs both adhesion and sealing rather than a hard structural glue line. Use it on qualified metal, composite, polyester, and coated parts after surface testing and current data sheet review.

Bostik 70-03A Applications

• Bus, caravan, train, and truck construction joints.
• Sunroof bonding and sealing in transportation assemblies.
• Roof bonding on buses, trains, trucks, and specialty vehicles.
• Corner profile bonding on aluminum or polyester trailer parts.
• Floor systems and welded seam sealing where elastic movement is expected.

Surface Preparation And Use

Prepare clean, dry, sound substrates before applying the bead. Remove oils, sanding dust, release agents, loose paint, and weak coatings. Tool the bead before skin forms, keep joint dimensions consistent, and confirm cure timing before moving parts into service or paint.

Run trial bonds when changing substrate, coating, cleaner, or application temperature. SMP sealants are forgiving in the right joint design, but production approval still depends on surface condition, bead size, cure depth, and service exposure.

Technical Details And Documentation

Bostik describes this product as an SMP adhesive and sealant for sunroof assemblies, composite assembly, and general bonding and sealing projects. Review current manufacturer information from Bostik before setting work instructions.

Ordering Help

For related elastic bonding and sealing materials, browse Chemical Concepts sealants and adhesives. For help confirming cartridge format, color, or substrate fit, call (800) 220-1966 or email [email protected].