A curing agent is a standard reactive polyamide intended for use in curing of epoxy resin .It is cut to 60 % solids by weight in xylene. When cured with high molecule weight of epoxy resin .it is provides cured films with such high orders desired at actual application field as good flexibility, simultaneously with good water resistance and good alkali resistance. Thus desired for heavy duty primer coatings application of anti corrosion resistance.