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I used a heavy duty velcro from Radio Shack and it worked fine. If you use that magic putty it will bond forever and cause damage if you try and remove it.
Oh , you're talking about the Z06/ FRC trunk deck....
Couldn't figure out what you all were having trouble with at first. I use the GM double head push in retainers for my leather cover panel. They work the same as GM door panels. Make a 5/16 slot in the panel and a 5/16 hole ( 6 total) to the inside of the trunk deck. Push and it stays, no sagging. GM part # 20451401. They are no visible.