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Laminating it would actually be permanent... it would melt the plastic to the build sheet or adhesive it to the build sheet...
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Quite correct! The plastic melts into the upper layers of the document.
If you remember being 17 and trying to take your driver's license out of the lamination to change the date so you looked older, you will know what I mean.
Nowadays all of us are trying to alter them to look younger.