A two-part curable urethane adhesive composition of the present technology contains a base agent containing a urethane prepolymer, and a curing agent containing a compound having two or more active hydrogen groups in each molecule. The curing agent contains at least one type of terpene compound selected from the group consisting of monoterpenes, hydrogenated monoterpenes, modified monoterpenes formed by modifying the monoterpenes or the hydrogenated monoterpenes with hydroxy groups, and oligomers having from 2 to 6 repeating units derived from the monoterpenes or the modified monoterpenes.

Described herein is a composition including at least one polyurethane polymer. Also described herein are a method of using the composition including at least one polyurethane polymer for metal pre-treatment and a process for metal pre-treatment.