It's never been easy to work with, but at some point they did change it a bit to make it easier to peel the backing away and without a doubt with a enough time it gets even harder to remove the backing.
I've also found if you expose the stuff to low temps (not sure how low) it tends to craze the material and make it even harder to separate from it's backing.
While the results in some cases are world class, working with the stuff has been very irritating for me as well.
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