So I have a customer that has a sign that uses the V-3 sta tuff material. It is no longer manufactured and I can't find a replacement material. I was just wondering if anyone has figured out a slick way to retrofit a sign like this. The sign is so big if I use a flat piece of polycarbonate I am going to have a lot of sagging and bowing even if I fasten the edges to the retainer with self tappers. Any suggestions would be appreciated.