How many different fluids are used to operate a can of spray paint?

A can of spray paint typically uses two different fluids: the paint itself, which is the primary substance that provides color and finish, and a propellant, which is usually a compressed gas or a volatile solvent that helps expel the paint from the can. The propellant can be hydrocarbons, nitrous oxide, or compressed air, depending on the formulation. In some cases, additional solvents or additives may be included in the paint to enhance its properties, but the primary operational fluids remain the paint and the propellant.