Most varicose and spider veins appear in the legs due to the pressure of body weight, force of gravity, and task of carrying blood from the bottom of the body up to the heart. Compared with other veins in the body, leg veins have the toughest job of carrying blood back to the heart. They endure the most pressure.
Curing a thermosetting resin transforms it into a plastic, or elastomer by crosslinking or chain extension through the formation of covalent bonds between individual chains of the polymer. Crosslink density varies depending on the monomer or prepolymer mix, and the mechanism of crosslinking:
Mark is right here - you need water to cure a slab properly. Curing is the industry term for what chemists would call hydration (as opposed to de-hydration with which humans are familiar) of the cement powder. Hydration allows for increasing strength (good) and, important but often overlooked, wear resistance of the slab (really good).