What it is: The process of chemically reacting monomers or oligomers into a chain or network which thicken and eventually harden into a solid material. This process is also referred to as polymerization.
How to use it: Polymer powders have this reaction when combined with liquid monomers. Gels (oligomers) when exposed to UV or LED light. Resins in wrap and dip systems respond to the heat in the nail to harden.