Abstract: A rotary can opening cutter provides a method of opening a can in order to reduce the possibility of spillage, facilitate consistent paint mixing and colorant addition, and provide re-sealing and subsequent mixing by shaking. After cutting, the "slug" is left to sink to the bottom of the can and thus saves any solvent or paint which was adhering to the slug. Since this operation is contemplated to occur while the can is in place under a colorant dispensing machine, the chance for spillage by actions of the paint attendant are eliminated. After colorant is added, a small plastic cap is forced into the hole to form a tight fit.