If you do it right its safe. I can just picture some junkie heating the acetone to evaporate and starting a huge fire. If you're a little patient the acetone will evaporate easily. If not you can do a double boiler kinda situation. Have the solution in a pan then place in a larger pan with heated/ not quite boiling water. Its actually cool to see the pure oxycodone after the acetone has evaporated. Its almost crystally.
I just got my script for the IRs. Though I'm trying to taper off. My doc wrote me for 10s, I was on the 30s before. I'm fine with the 10s though, I got my doctor to give me a 6 weeks taper schedule so I'm happy. Its a nice weight off my shoulders just knowing I have a plan and a sufficient amount to taper with. Before I was always running out and worrying about having to get back to the doctor or desperately searching everywhere on "the street". Buying dope and OP80s to hold me over until I could afford to see the doctor again.
edit
I think racing fuel is methylone or something like that. Not really sure. I did hear something about someone using that. With the acetone when I saw it done it was left for around 20 minutes and agitated/stirred a couple times. I honestly think it wouldn't even take that long, but no one was in a hurry. We were just hanging out watching football and getting stoned. Acetone will evaporate quickly so if you left it there for an hour, it would probably be just powder/crystals sitting there when you came back to it.