1) Varnish or Viagra 
• (n.) One who, or that which, hardens; specif., one who tempers tools.
1. (abbr.) Armor Hardeners and variations. 2. (abbr.) Shield Hardeners and variations.
A chemical added to a thermosetting resin to assist its cure. 
Curing agent for epoxies or fiberglass.
A cross-linking agent used to cure a resin or paint system.
Hard'en·er (-'n*ẽr) noun One who, or that which, hardens; specif., one who tempers tools. 
Substance used to promote or control curing action by participating in and being consumed by the cure reaction. (See also catalyst.)
See catalyst
An alloy containing at least some aluminum and one or more added elements for use in making alloying additions to molten aluminum. Also referred to as Master Alloy.
A substance or mixture of substance added to a material to increase or control the curing reaction by taking part in it.
A chemical applied to concrete floors to reduce wearing and dusting.