A two-pack type plastisol composition comprising two liquid compositions (LA) and (LB), characterized in that the composition obtained by mixing the compositions (LA) and (LB) has a gelation time (as measured at 30.degree. C.) of 1 hour or shorter. It is a novel material which gels at ordinary temperature in 1 hour, preferably in several minutes, to come to have practically sufficient performances. The composition (LA) preferably comprises fine acrylic polymer particles (A) and a dispersion medium (B) in which the particles (A) are substantially insoluble at ordinary temperature (provided that the particles (A) may be soluble in the medium (B) at elevated temperatures). The composition (LB) preferably comprises an organic solvent (C) in which the particles (A) have sufficiently high solubility at ordinary temperature.