PURPOSE: To reduce the man-hours for defoaming work and improve productivity upon forming an outermost layer or a backup layer in the case of manufacturing a reinforced plastic molding such as a waterproof pan.

CONSTITUTION: Gel coat resin is sprayed against the surface of a molding die to cure and form a gel coat layer 21 and, thereafter, reinforcing fibers are sprayed together with thermosetting resin while cutting them into the length of 2-10mm to laminate and form a short fiber reinforced layer 22. Next, reinforcing fibers are sprayed together with the thermosetting resin while cutting them into the length of 25-50mm to laminate them and form a long fiber reinforced layer 23. Further, reinforcing fibers are sprayed together with the thermosetting resin while cutting them into the length of 3-9mm to laminate them and form a short fiber backup layer 26.