Sorry No Trick or Treat Halloween Yard Sign - Coroplast Visible Text Quarantine - Social Distance Halloween No Trick or Treat Yard Sign with Metal H-Stake. Economical and durable, our Coroplast Yard Signs are a staple of outdoor advertising. These outdoor, Sorry No Trick or Treat Halloween Yard Sign full color direct printed graphics are vertically fluted for use with an H-Stake. Coroplast is typically used for yard, parking, real estate, and election signs. They are waterproof.