Originally Posted by
QuiltE
Corroplast is corrugated plastic .... think of cardboard boxes, but plastic.
Like cardboard, it's only about 1/4" thick.
Sign shops often use it for inexpensive, waterproof signage.
Okay now I know. I got a pack of thumbtacks on a card of this. I had no idea what it was called. It's a good thickness and very sturdy.