A spray system for dispensing a homogenous mixture of a liquid formulation and propellant as an atomized aerosol where a disposable container containing a liquid base is used alone or secured within a rigid container and is charged through a fitting in fluid communication with the interior of the disposable container using a detachable pressurized charge can containing a propellant compatible with the liquid base. Preferably the liquid formulation is a paint base that can be tinted at the point of sale before charging with the charge can.