I disagree, tape isn't that reliable for covering larger areas with sharp and uneven surfaces. Plus, it tends to peel off by itself when heated. Should be better to just secure the two boards apart from each other at opposite ends of the case.
Thanks for the tip! I guess covering my tracks with a fire isn't a good option.
Self-fusing silicone tape would be an adequate solution, I would think, esp. if you wrapped a couple of times.