Acid epoxy clear coatings was introduced because of VOC satisfiability and appearance advantage,however its poor storage stability leads to a typical tackify problem.As time goes on,the viscosity of acid epoxy clear coat would become higher,so the appearance may get worse to some degree as well as VOC.To address this issue,the tackify mechanism was analyzed,the control of storage adhesion and low renewal rate acid epoxy varnish in the system were further explained.