Polymer additives for synthetic low-molecular-weight picture varnishes are described. These may modify rheological properties of the varnishes, the appearance that can be obtained with them and the brittleness of the dry films. Styrene-ethylenebutylene-styrene rubbers and a hydrogenated prolyisoprene rubber were added at 10 per thousand to hydrogenated hydrocarbon resins. Poly (n-butyl methacrylate) was added at 10 per thousand to an aldehyde resin. Long-term aging in a xenon arc Weatherometer of films of the low- molecular-weight resins as well as of films of low-molecular-weight resin/polymer mixtures indicates that they are stable when a hindered amine light stabilizer is incorporated. No insolubility caused by crosslinking appears to occur in these films. -- CAL