The mechanical properties of strength, modulus, and elongation to break were studied for artists' acrylic and alkyd paints under varying conditions of temperature and relative humidity (RH). In the ambient environment, 23°C, 50per thousand RH, acrylic paints are very flexible and are able to sustain large deformations (greater than50per thousand). Alkyd paints are much stiffer and stronger, and they cannot sustain deformations nearly as dramatic as the acrylics. Acrylic paints at 5per thousand RH are stiffer and stronger thatn at 50per thousand RH and their ability to stretch is lessened. At temperatures below 15°C at 50per thousand RH, the strength and stiffness of acrylic paints begin to rise rapidly. Some were found to brittle at 5°C, and by -3°C, all were brittle. At a lower RH, some acrylic paints became brittle at a temperature near 11°C. These temperatures and relative humidities may be found in the transport environment of art objects, and may render them subject to possible damage. -- CAL