Epoxy hardener is the second component of a two-part epoxy system. When it is mixed with the resin, a chemical reaction turns the liquid into a hard, durable coating.
Understanding Epoxy Hardener
Epoxy resin on its own never cures into a floor. It needs a hardener, usually an amine, to link the resin molecules together. This is called a cross-linking reaction. The type of hardener sets how fast the epoxy cures, how flexible it is, and how well it handles heat, chemicals, and UV light.
Why the Mix Ratio Matters
Resin and hardener are made to react at a set ratio, such as 2 to 1 or 1 to 1 by volume. Too much or too little hardener leaves unreacted material behind. That can cause soft spots, a sticky surface, amine blush, and poor adhesion. Always measure by the data sheet and never guess or eyeball it.
Fast, Standard, and Slow Hardeners
Many systems offer different hardeners for the same resin. Fast hardeners suit cold weather and quick turnaround jobs. Slow hardeners give more working time in hot weather or on large floors. Changing the hardener changes pot life and recoat windows, so check both before you switch.
Practical Tips for Using Epoxy Hardener
Store hardener sealed and out of heat, since it can absorb moisture from the air. Use only the hardener made for your resin and do not mix brands. Mix for the full time listed, scrape the sides and bottom of the bucket, and pour into a clean container before you apply.
Also Called
Part B, Curing agent
