Coroplast has a bit of transparency to them and requires H frames to hold them up. If your sign is wider than 24” than it will require two H frames per sign.
Posterboard is non see through so won’t have any sunlight distortions and uses U frames which are bigger and sturdier frames than H frames. One frame is only required for 24” wide or wider.
Both do the job for full color signage.
The Better line is made of a non see through polyetheylene plastic. The size is 16″ x 24″.
