Raytech sky plast raytech sky plast this pack contains two 250g tubs of raytech sky plast a two component putty that when mixed together in equal parts will cross link into rubber after only five minutes it also boasts non toxic attributes is fume flameproof and fire retardant is re enterable has high dielectric characteristics and is mouldable just mix together equal parts of the blue and white putty from the tubs until they reach a consistent sky blue colour once this has been achie