an adhesive and coating composition which is suitable for use in an aqueous environment is provided and which comprises a resin - plasticizer modified acrylonitrile - butadiene elastomer , dissolved in low - toxicity solvent . a method for repairing plastic sheet materials , particularly plastic sheet materials such as polyethylene , polypropylene , polyvinyl chloride and polyvinylidene chloride , using the adhesive and coating composition wherein certain controls are effected is also provided . such an adhesive composition provides a fast and extremely effective means for repairing perforations and tears in plastic sheet materials , is long lasting , safe and does not discolor over time .