I realize a few of you are being helpful, I see you giving answers to some very basic questions in multiple threads and I shake my head every time I see these kinds of posts.
Don't you think that the most basic questions asked might be the most dangerous?
The electric sign industry is still a trade, it's not a google or forum learning trade school.
How do you now if he wasn't the person who did this job in the first place and why a poly-carb face sailed in the air like a guillotine in a wind storm?
Not saying that he was the person, but basic as the question is to us, your answer comes with no discipline gained/earned on his part, and what comes with that discipline.
I can see if the question was "..what has been the best result for bonding Poly-carb to trim cap...a two part epoxy...channel bond...or using typical 16 Weld-On?" At least it sounds like the person has been around in the trade and we need to break them out of bad habits of using Weld-on 16 for bonding poly-carb.
The other part is, you're killing the market for other shops in a another area. Ask yourself......would you answer these questions for a local sign guy who shows up at your business?
I don't know the structure but a 2'x8', in who knows the wind conditions does not sound safe for a trim capped face, probably a metal retainer