It sets by a chemical reaction with water, not by drying. The reaction gives off heat, so the plaster becomes warm as it sets.
In our tests SIG-MR reaches a peak of 48 to 53 °C while it sets. Because the plaster sets by reaction, it needs no water curing afterwards.
Safety: never let plaster set around a hand, a finger or another part of the body. The heat can cause severe burns.