CV is cheap. Redo it the way they want. Eventually the regional manager will show up and notice you cant read it then they will sort it out internally and call you to come back and do it white. you get paid twice.
maybe your camera is bad. My FC8000 had the camera go bad. they replaced it and no more problems. we cut thousands of decals every week on the graphtec fc8000-160. lots of tiny .5x.5 decals with tight registration. keep the length down. also keep the L mark about 2" away from your print.
easiest fix is print two posters on paper.
the only solvent two sided media I have found is ultraflexx 15oz smooth block out banner.
your main problem is going to be registering the front print to the back print which is not easy on a roll fed printer. and if you do accomplish registration...
I need one widget that does everything and cures cancer and feeds all the kids in the world and stops all the wars. anybody have any idea? haha.
cups and hard plastics - you need a pad printer
fabrics - silk screen
what is Poly? polypropylene banner? i think its too thin for double sided. image from one side will show on second side.
print two and marry them?
or you can get:
ultraflexx smooth 15oz PET banner with blockout
duratex 12oz smooth double sided PVC banner