Quoted from john17a:
Thanks we have a product called orange power goo and glue remover i find getting a few drops under mylar =whatever= then just using a longish finger nail to slowly ease it up works but mylar over clearcoat shouldn't lift insert decals id hope
Others can comment on why, but no - the Diamondplate is laid on TOP of the artwork and other layers, so it's not the strength of the Diamondplate's adherence to the inserts, but the paint and layers under it. AFAIK, there was a clear-ink layer put down over everything (including the clear, unprinted inserts) before the top clearcoat (Diamondplate) layer was added.