a method and process for treating wood . the steps include preparing isocyanate - based reactive prepolymer resins for impregnation , impregnating wood with these impregnation resins , curing the impregnated wood at elevated temperatures , preparing isocyanate resin - based coating materials and applying these coating materials on the cured impregnated wood and curing the coatings at room or elevated temperatures . the resulting treated wood has substantially improved de - contaminability of the chemical warfare agent vx both initially and after long exposure to degradation effects from sunlight .