Surface finishing material, curable at room temperature, for indoor and outdoor.

A surface finishing material, curable at room temperature, for indoor and outdoor use, comprising a polyurethane-based composition comprising the reaction product of a) an A side comprising a urethane prepolymer having terminal isocyanate groups comprising the reaction product of 1) a polyisocyanate comprising 50% by weight or more of 2,4'-diphenylmethane diisocyanate with 2) at least one polyol, b) a B side comprising 1) at least one polyol, 2) a crosslinker and 3) a filler comprising an acid filler having a pH of less than 7.