In a touch up kit for painting small surface areas, an outer container contains a paint or primer coating material and an inner container contains a catalyst for the paint or primer material. The inner container comprises a bottom seal member closing the bottom of the inner container and an upper seal member closing the top of the inner container. The inner container is nested in the mouth of the outer container. The upper seal member is pierceable by a blunt instrument such as the inlet tube of an aerosol spray canister and the bottom seal member is designed to be detached from the bottom of the inner container in response to downward pressure on the bottom seal member by the inlet tube of the aerosol canister. In use, the inlet tube of the aerosol canister is used to puncture the upper seal member of the inner container and to exert downward pressure on the bottom seal member to completely detach it from the inner container allowing the catalyst in the inner container to drop into the paint or primer coating material within the outer container. The assembly of the inner and outer containers is vigorously shaken to thoroughly mix the catalyst with the paint or primer coating material. The canister is then used to spray the paint or primer mixture on to the surface to be coated. Following the coating process the remaining material in the two containers is allowed to dry whereupon it can be discarded in conventional trash.