catalyst

A liquid chemical consisting primarily of methyl ethyl ketone peroxide, added in small amounts to resin as a hardening agent. Once the catalyst and resin are mixed, a board-builder (or ding repairman) has to complete his task before the resin "goes off" and becomes gelatinous and unworkable. Temperature and humidity affect the timing of this reaction, but usually an ounce of resin mixed with 10 dr...