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Not a bad idea at all, verrry cheap way to get mylar; another good idea like that is dollar store wrapping "paper", many of the plastic kind are actually mylar with printing on one side.
The only downside to this kind of mylar is how thin it is. Mylar made to be hung on walls and the like is usually a good deal thicker so that it is less prone to tears and wrinkles but if you are careful, that is irrelevant.
On the other hand, cheap mylar is easier (on the wallet) to replace and if you've ever tried to clean mylar, you will know how easy it is to dull the finish which warrants replacement despite how expensive/thick the maylar you chose.