Low viscosity moisture tolerant Epoxy hardener 2609WB used as protective coatings /Industrial applications Product. Description Epoxy Hardener 2609WB is aliphatic polyamine Mannich base curing agent designed for use with liquid epoxy resin. It is of low viscosity, moisture tolerant and reactive at low temperatures (-5°C). 2609WB will react with liquid epoxy resins at low temperature and high humidity to produce a chemical resistant surface coating. The physical and chemical