Yes the heat gun will take away all the gray and bring it back to black. I ran mine at around 600 degree. Setting 6 of 10 on my gun. I keep it a few inches away from the cowling. You'll see it start to turn after about 30 seconds. It took about 15 minutes. Note not at all like the beautiful respray done here. But good enough till I get the time to do the respray this fine fellow did here. Can't wait.....