A post cover with advertising for use with a substantially semi-circular guard post of the type commonly found surrounding fuel pumps at gasoline stations. The post cover has a substantially semi-circular shape with an interior cavity dimensioned to receive a generally semi-circular guard post in slip fit engagement. The cover is generally molded of a resilient, durable, low maintenance and exposure resistant structural plastic that can be treated during the molding process with coloring agents and chemical additives to enhance its esthetic and resiliency character respectively.