Re: Zootopia- carrots for one, how to print and seal a food safe custom microwave din
For the seal you can just use a double stick tape or the 3M stickier booger style double stick.
Once you get your real meal tray you will see the printed top paper cover is about 2-3 layers. Printed paper, soft white paper like thin cardstack, then either plastic or a foil line layer.
Or
You might want to check to see if clear protector vinyl that is used on ipad screen will stick, then you can just 3d spraymount your printout to it. It is kind of like making a static cling. But it depends on the dinner tray material.
please post pics, sounds like a cool project.