Epoxy hardener HW- 3 540 is a low-viscosity, solvent-free cardanol modified PAA curing agent mainly used in epoxy coating systems . The product features low viscosity , rapid curing , low surface treatment requirement, high glass transition temperature, good bonding strength, excellent chemical resistance, and excellent adhesion even on wet or untrea ted substrate surface. Due to the excellent water resis tance and corrosion resistance, it is very suitable for heavy-duty