We print a lot of signs on Sintra, a foamed PVC sheet that is a very common sign making material. Here’s a photo of my favorite way to mount it to a board.
Here they are using flat head screws to mount the Sintra sign to a plywood panel. You need to use flat head screws so that the screw doesn’t split the Sintra. If you use a regular deck screw, the trumpet shape will do just that.
We print Sintra with our UV curing printer. That gives you bright happy colors that are durable and light fast. For extra protection, we can coat the Sintra with a clear coating that provides extra protection from the elements.