PRIMER FOR SEALANT

PROBLEM TO BE SOLVED: To obtain a primer for sealants capable of forming coating films excellent in adhesion to the surface of a sealing material, and further having excellent bleeding contamination-preventing property, excellent impact resistance, etc., by compounding a specific acryl-modified epoxy resin, a curing agent and an organotin compound. SOLUTION: This primer for sealants comprises (A) an acryl-modified epoxy resin containing alkoxysilyl groups, (B) a curing agent for the epoxy resins and (C) an organotin compound. Therein, the component A preferably comprises a resin formed by reacting an epoxy resin with an acrylic resin containing carboxyl groups and alkoxysilyl groups. The component B preferably comprises a polyamide resin modified with a ketiminized dimer acid and having a ketiminization ratio of >=80%. The content of the component C is preferably 0.1-10 pts.wt. per 100 pts.wt. of the solid contents of the resins. The primer for sealant preferably further contains (D) a silane coupling agent in an amount of 0.1-10 pts.wt. based on the solid content of the component B.