PURPOSE: To obtain an unsaturated polyester putty composition exhibiting high adhesivity especially when used in a vehicle, by mixing specific principal agent, thinner and hardener at specific ratios.

CONSTITUTION: The projective putty composition can be produced by mixing (A) a principal agent consisting of (i) 100pts.(wt.) of an unsaturated polyester, (ii) 0W100pts. of an ethylenic unsaturated monomer, (iii) 1W10pts. of a cure assistant, (iv) 100W300pts. of an extender pigment and (v) 0W5pts. of a colorant, (B) a thinner consisting of (i) 100pts. of an ethylenic unsaturated monomer, (ii) 10W300pts. of a polyisocyanate compound and (iii) 0W50pts. of an organic solvent and (C) a hardener consisting of (i) 100pts. of an organic peroxide, (ii) 100W900pts. of an organic solvent and (iii) 0W100pts. of an extender pigment. The weight ratios of the components A/B/C are 100/(1W30)/(5W30).