The Army Painter: Green Stuff
The original Kneadatite (best known as Green Stuff) is used by model makers and hobbyists for conversions, filling mold lines and sculpting miniatures. Hardens fast with a 20-30 minutes worktime for molding & only 8 hours to fully dry. Mix equal parts of yellow & blue putty until you get an even green colored putty.
Use with super glue to glue larger components.