The term “viscosity” refers to the thickness or flow-ability of a liquid. Viscosity numbers range from one to millions of centipoise(cps), When it comes to polyurethanes and epoxies, keep in mind that temperature can have a major impact on a resin’s viscosity. While heating a material can thin its viscosity substantially, the working time(gel time) of the material is shortened as well. As a general rule, for every 10° Celsius you heat the material above room temperature, the gel time is cut in half. The chart below should be used as a general guideline only.