I'm looking at using push-ins where I need to mount Coroplast and have access to the other side. Some are acorn pushins and some look like a flat piece of metal stamped with a hole that will accept a screw but still keep some tension on it so it won't back out. You could just add a spring on a screw or mount a grommet on the coroplast and hang it with a spring. I'm still exploring ideas too.
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