Bob pretty much hit the nail on the head. He's a pro at this. Permanent cold-mount foils are the norm, but are utterly unforgiving. They can be used on a variety of smooth substrates. Some like Gatorbd require pre-sanding. Unless your print is small, you need a pressure roller system and some serious practice. Best done by a pro with a clean room. Acrylic is a poor backer choice because it changes dimensionally or bows with humidity cycles. Static mounting is an elegant technique for relativey small prints is you have a low-humidity work environment to begin with. I developed a proprietary hermetic face-mounting technique which differs from the others; but like them, it too was laborious and expensive.