A weathering test was conducted at three regions in Hokkaido for eleven years Color, weight and gloss were measured and defects were inspected annually. The data were analyzed statistically and rankings concerning weatherability were decided. The specimens which were consist of aluminum alloy or galvanised steel as substrates with polyvinylidenefluoride as vehicle of baking paints showed best rankings. AIl population means of these properties increased with the lapse of time throughout the test term. The best rankings were found for Rumoi concerning discoloration, for Rumoi and Kitami concerning gloss decrease and for Sapporo and Kitami concerning maximum defectless terms.
