Why did button copy and demountable copy last so long on BGSs? Other signage such as warning signs and even LGSs they were using some kind of adhesive type tape for the characters (lettering symbols etc) since the beginning of time it seems..at least the 60s. How come it wasn't used on BGSs?
Adhesive type tape for the characters on this old shield from the 60s.
(https://live.staticflickr.com/4416/36383066542_18df283230_z.jpg) (https://flic.kr/p/Xr3J7J)
Button Copy from NYC
(https://live.staticflickr.com/7898/46542431915_506b3c6eea_z.jpg) (https://flic.kr/p/2dUN8uF)
My understanding is that early reflective sheeting (i.e. 3M silver Scotchlite) required the application of heat to activate the adhesive. While this is fairly easy to do with shield-sized signs (there are photos of Texas baking such signs in an appliance somewhat similar to a George Foreman grill), with freeway signage it is too large to be feasible.