Need help picking substrate on billboard type signs

[divers2deep]

I am redoing a billboard type store sign. The main pillars are 8"posts in good condition, the cross members on the inside are also in good shape. I will be removing the plywood and replacing it with vertical 8'x4' pieces. the measurements are 8'x24'. what are your recommendation on a substrate to use on this. I will be using cast vinyl and lam on this substrate.

 

[SignManiac]

My first go to substrate would be a polymetal product like DiBond, MaxMetal, PolyMetal, BeBond, etc. etc.

 

[Gino]

Same here. Aluminum composite of your choice.

 

[tattoo.dan]

I have done signs like that with max metal

 

[2B]

+1 all the above

6MM will ensure better wind support