Oil paint films were exposed to solvents including toluene, acetone, and triethanolamine for varying lengths of time. Weight measurements show that evaporation of the volatile solvents acetone and toluene from paint films is essentially complete within hours. These dried films weigh less due to extraction of components including glycerol, azelaic acid, fatty acids, and mono-, di-, and triglycerides. Stress-strain measurements show measurable changes in stiffness in bulk films after as little as 30 seconds exposure to the volatile solvents. Dried films are stiffer and somewhat more brittle than unexposed films due to the loss of plasticizing compounds. The ability of paint films to safely tolerate moderate (+/- 15) fluctuations in relative humidity as one layer in a painting is unaffected. In contrast, the nonvolatile solvent triethanolamine (TEA) does not evaporate appreciably even after two weeks. Exposure to TEA results in a permanent decrease in stiffness.