The aim was to examine the permanence of the paints tinted by a new C base (no. 6) resulting from development work and by an earlier C base (no. 3).
Sample no 3: Virtanen’s 4-oil quality paint C base Tinted by Teknos’s TL paste
Sample no 6: Virtanen’s 4-oil quality paint NANO C base Tinted by Teknos’s TL paste
The samples were exposed to 1 000 hours of ultraviolet radiation, in which the radiant power of UV radiation corresponds to the radiant power of the sun on a bright summer day. The amount of energy of the UV radiation accumulated is, on average, of the same magnitude as the amount of energy accumulated on a horizontal plane during the period of one year in Southern Finland. The temperature of a yellow paint surface during the test was about 50–55°C. The test also included a 24-hour moisture stress. The test method is based on the ISO 4892-3 standard.