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Friday 27 October 2017 at 15:57
A simple glue stick rubbed on the side of the backbox will re-adhere those peeling decals. Right side of my game started peeling like that and it's been fine for 6 months now. I have a replacement sideart, but I didn't want to use it if I didn't have to.
Source: http://pinside.com/pinball/forum/topic/metallica-owners-thread/page/237#post-4042058