A two-part epoxy putty. Upon mixing an equal quantity of each different bar the material starts to harden, and hardens fully in 90 minutes, after which it can be carved, sanded, drilled, and sculpted over.
In combination with water will allow getting extra smooth surfaces. Allows easily merge new layers of milliput over. Will not get stuck to your either your fingers or your tools. Once dried, it can be carved, sanded and drilled. Heat resistance up to 130ºC.