PURPOSE: To carry out surface protecting operation even at the beach district where the operation is easily affected by moisture or even when foul weather by a method in which the surface of a member is coated with the prepreg tape of ultraviolet ray curing type and further its outer surface is coated with the coating agent capable of forming an ultraviolet ray transmitting coat.

CONSTITUTION: A steel pipe 1, etc. is coated with anti-corrosive paint 2 and the prepreg tape 3 of ultraviolet ray curing type is wound thereon and further said tape is coated with the coating capable of forming an ultraviolet ray transmitting coat e.g. the epoxy resin of room temperature curing type and is cured. To cure the prepreg tape of ultraviolet ray curing type, the solar ray is applied onto the coat or the exposure to an ultraviolet ray lamp, etc. is used. Said prepreg tape of ultraviolet ray curing type is made of the matrix impregnated or coated with the ultraviolet ray curing resin, vinyl family monomer and thickening agent, etc., The prefetchly cured material has the tapes adhering mutually and fully, and is excellent in waterproofness and anticorrosion.