West System Epoxy Lent 105/206B Kit: Resin 105: transparent, low-viscosity liquid epoxy. Hardener 206: low viscosity, high strength, ideal from 15°C upwards. Moisture-resistant, excellent for bonding and coating. Ideal for extending assembly times. WEST SYSTEM epoxies are waterproof, non-shrinking, odorless, solvent-free, more flexible, high adhesion on all materials.