What Sticks to Coroplast?

I had to cut a 2' x 2' hole in mine to do some tank valve work. I went to a local graphic sign shop and the gave me a large piece of black coroplast (same material they use to make yard signs). I cut the right sized piece I needed to cover my hole with 2" overlap on all 4 sides. I used 1/2 self tapping screws to secure the new piece in place then sealed the edges with gorilla tape. It has held for 2 years now.
I can also remove it is needed to service my valves in the future without cutting and then can replace as needed.