Abstract: Two-component paint system comprising a binding agent component and a curing agent component which are separated from one another prior to application of the paint system and are brought into contact with one another for application, so that the binding agent in the binder component crosslinks by contact with the curing agent component, with the binder component containing, in addition to the binding agent, at least one solvent which is unreactive with the curing agent component, a crosslinking catalyst and a propellant agent, characterized in that the curing agent component is obtainable by pre-reaction of a deficient amount of a bi- or trifunctional low-molecular-weight active hydrogen-carrying compound with an isocyanate-based crosslinker having a residual content of monomeric or dimeric isocyanates of ?1% w/w, said paint system being contained in a 2K aerosol spray can provided with an inner casing.