To provide a spray agent having good sprayability and excellent fixing properties and sagging preventing properties after spraying, slip during coating and finish after coating (slight unevenness of spraying).

This spray agent is obtained by filling a composition comprising specific cellulose fine particles and a liquid dispersion medium in a spraying device. The cellulose concentration in the composition is 0.1-5.0 wt.% and the maximum value (ηmax) of viscosity in a viscosity-shear curve of the composition at 25°C obtained in a shear rate region including at least 1×10-3 to 1×102 s-1 measured by using a cone-plate type rotational viscometer is ηmax≥1×103 mPa.s.