The present invention relates to a thermosetting composition characterized in that it contains (A) a
polyester resin of number average molecular weight 1,000-10,000,
hydroxyl value 5-200 mg KOH / g and, (B) 0.5-2.0 equivalents relative to the hydroxyl groups of the aforesaid component (A) of a compound (B) which is a blocked aliphatic
isocyanate compound having reactivity with the hydroxyl groups of component (A), wherein the blocking is with methyl ethyl ketoxime and / or ε-
caprolactam, (C) 0.05-5 parts by weight of a
bismuth compound, per 100 parts by weight of total resin solids of component (A) and component (B), and (D) 0.5-50 parts by weight of an organosilicate represented by the following general formula (I) and / or a condensation product thereof, relative to 100 parts by weight of total resin solids of component (A) and component (B) wherein R1, R2, R3 and R4 in the formula each mean
hydrogen atom or 1-10
carbon organic group, and can be the same or different, n is 1. By using the thermosetting, not only does
stain resistance appear a short time after painting, but also excellent
stain resistance is maintained for a long period, which fulfil the paint film performance requirements for painted steel sheet such as
water resistance and bending workability and which have high
environmental protection qualities and safety.