Provided is a container assembly including a storage container and a catalyst container. The catalyst container includes a reservoir for holding a second material, such as a reactive hardener or activator as used in 2K coating systems, or a catalyst, the reservoir having a spacer extending therefrom, and a top member removably secured to the reservoir. The top member is secured to a spout of the storage container and is movable with the spout. The spout of the storage container is movable from a closed position to an open position thereby moving the top member away from the reservoir and separating the reservoir from the top member, which causes the reservoir to drop into the storage container to mix the catalyst with a material in the storage container.