Valentines Day Love Yard Sign Letters, Valentines Theme Decorations Love Candy Heart Props, Valentines Love Yard Signs With Metal Stakes. Economical and durable, our Coroplast Yard Signs are a staple of outdoor advertising. These Valentines Day Love Candy Heart Yard Cutouts Outdoor full color direct printed graphics are vertically fluted for use with a Stakes. Coroplast is typically used for yard, parking, real estate, and election signs. They are waterproof.