Abstract: The present invention relates to a flexible industrial adhesive composition which effectively bonds thermoplastic polymer substrates and substrates having low stiffness such as fabric, rubbers and asphaltic materials, to materials selected from metals, fabrics, rubbers, engineered materials, and concrete, said flexible industrial adhesive composition comprising:(a) one or more epoxy resin(s) having an average of at least 1.5 epoxy groups per molecule;(b) a liquid amine terminated polyamide prepared by reacting at least one C.sub.18-50 dicarboxylic acid and an aminoalkylpiperazine in a ratio of moles of aminoalkylpiperazine to equivalents of carboxyl group in the acid of greater than 0.75:1;(c) one or more optional polyamine(s); and(d) one or more optional filler(s);wherein the tensile modulus of the flexible industrial adhesive composition is less than 500,000 psi and the tensile elongation of the flexible industrial adhesive composition is greater than 10%.