how would you do this?

[SignManiac]

Maybe 2" wide strips of 040 aluminum behind the seams with double sided tape to keep them flush with each other.

Or a 1/2" strip of white vinyl after install to hide the seams. Wouldn't be very noticable if the whites matched.

This would be my solution too.

 

[Signed Out]

This

(Replace the ACM with .080 white sheets).

To be honest, I didn't know the ACM sheets would not butt tight. What if you were to run the edge down your table saw at a 5 degree angle?

Actually, either of your first 2 options may work. I'd be tempted to try the krylon myself. If you were to "wrap" the edge, the only way it wouldn't stick out, is if you did a full cover on the sheets.

Just how tight did you bid this job, that you can't add some alum angle, and are stuck using ACM?

They butt up pretty good, but from a few feet away there is a pretty noticeable dark seam. By sheeting the ACM panels and wrapping the edges, I mean the whole sheet, not just where the logo is. When we bid on this job a few months ago, the artwork was still up in the air, so we assumed it would be full coverage. However, now that we have the artwork, and it is mostly blank white space, the install could be a lot easier if we just put the ACM sheets up on the wall and then laid one big decal on. BUT, we aren't going to do that if it will not look as good, or be as durable as(if we paint the edges), sheeting the entire ACM panels and wrapping the edges beforehand in the shop.

It's not that we bid the job too tight. We can't just change their specs, this job was bid on by multiple companies, we were all given the same specs. We actually weren't the lowest bidder either...