To achieve optimum adhesion, repair surfaces should be scuffed and/or lightly sanded and cleaned free of grease or dirt prior to application.
Side-by-side tape: Cut or twist off a length of tape and mix by kneading with damp fingers to a uniform color. Any length contains the correct ratio of base to curing agent. Apply within 1 hour of mixing.
Bars: Cut or twist off 1 part blue curing agent to 1.5 parts yellow base. Mixing proportions can be adjusted to control cure time and hardness: more blue produces a faster, harder cure; more yellow results in a slower, softer cure. Mix by kneading with damp fingers to a uniform color. Apply within 1 hour of mixing.
Blue/Yellow has a 1 to 2 hour work life, Functional cure occurs in 4 to 5 hours when Blue/Yellow can be drilled, sawed, carved, sanded, stained, and painted. Ultimate hardness is reached in 20 to 24 hours. Cured color is green.
Additional sculptor information can be found by referring to PSI's Sculptor Tips or by checking our Users' Tips webpage.
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Kneadatite Blue/Yellow ("Green Stuff") is a two-part epoxy/polyamide sealant/adhesive for interior and exterior maintenance and repair. It has excellent adhesion to stone, ceramic, metal, wood and many plastics, including vinyl. 
Nicknamed "Green" by sculptors and modelers, Blue/Yellow is well-known for its long worklife, non-grainy texture and ability to hold fine detail. Cured models withstand up to 4 vulcanizations. Blue/Yellow is not intended for structural applications. 