Durepox Reactor, or Hardener, is a clear colourless aliphatic polyisocyanate resin solution used as the hardener component for Durepox 2K Primer and Durepox High Performance Clear base components. This hardener is designed to reduce critical recoat time, increase dry time and improve chemical resistance.

Durepox requires a 4:1 mix ratio of base to reactor and also needs to be reduced according to application specific conditions.