Not sure about using the clear tape though.
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Me either. So the packing tape is all that holds the art in place.. on the edges?? hmmmmm... would be no good for plastics that have no clear border, ie that the art goes to the edge of the plastic. I agree mylar or contact would be a MUCH better choice. As mentioned the packing tape would yellow/fall off over time.
Also when drilling, the plastic would need to be held dead flat on a flat surface (piece of plywood/mdf etc) otherwise you might end up with plastic shavings between the printed art and the plastic.
