Had a crack at this today with a pair of Panaracers & I must admit I approached this task with some reservations, not least was the concern it might knacker the original tyre graphics, so I ran a test with an older tyre same brand/model etc and this worked fine. No discernible difference to the tyre but more importantly the graphic survived.
So, on with the bake. The oven was preheated to 100 degrees and the tyre were popped in.
12 minuets later and I was absolutely stunned at the difference! Check the photos below (I however ran outside with them as they stunk the house out!)