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Simpson Strong-Tie offers reliable easy-to-dispense products for a variety of restoration applications including structural restoration pick-proof sealing and water-intrusion prevention. The Crack-Pac two-part high solids low-viscosity crack injection epoxy is designed to repair cracks in concrete. The mixed adhesive has the viscosity of a light oil and a low surface tension that enables it to penetrate fine to medium width cracks. Resin is contained in the cartridge and hardener is contained in the nozzle. Once the nozzle is threaded onto the cartridge the hardener is released into the resin-filled cartridge by turning the knob at the base of the nozzle. The two components are mixed by shaking the cartridge.