I would be hesitant because the paper is not water-friendly. When you use steam, it can crinkle and such, so I have the feeling the ink would smear rather than dry. Another consideration is the age - as it gets older, the paper and glue can separate. You don't want this happening in the machine.
If you are thinking of using it in a laser printer - NO WAY - the fusing unit that sets the toner will melt the glue. Probably void your warranty and get you a bad reputation in the repair shop.
By way of experiment, if you have any of the paper peeled off, you could try running it through to test for smearing.
I would be willing to bet the company says no, just because you cannot cover the liability from so many different printers and inks that folks use, Looking over my last few printers, there is a world of difference between them.
I keep scrap paper around and use that for patterns and such.