what is sign-a-bond?
how thick?
installed where?
marquee meaning what?
like Gino said, take a little more time and make a better effort to give us all as complete of a picture as possible, so we can spend our free time helping you instead of asking WTF you're talking about.
did you make this already? 4x10?
..and you lettered (or printed) both sides already?
I sure hope it's 3/4" thick... if you need to put a 4x10 up in the wind, held only by a frame... sounds like a nightmare to me... how much of the perimeter of the layout can afford to be lost in the frame?
to me, I would probably tell the client, here's your sign you ordered... if you want me to help make a double face version, we can use this first sign as one face, and I'll have to build a framework for support, and make a second sign for the other side.. because framing that first sign was your idea, not mine... as far as i know, it's sounds far more like a liability then a problem I'd want to solve...