West System Rapid Epoxy 105/205C Kit: Resin 105: high-strength, all-purpose epoxy for boats. Hardener 205: for rapid curing, effective from 5°C. Ideal for bonding and impregnating wood, fiberglass and composites. WEST SYSTEM epoxies are waterproof, non-shrinking, odorless, solvent-free, more flexible, high adhesion on all materials.