No you don't physically touch it. You hold the heat gun quite close to the panel moving it quickly left and right or up and down along the scratches. The plastic sort of heals the scratches under the heat. The best thing is to start prob 2 inches away and work your way closer. It's better to under do it than overdo it, move it quickly for a couple of seconds then move it away, then back again, as it gets hotter you will see the damage heal. The trick is obviously not to get it over hot or you will end up with a mess.That's quite impressive. Do you just heat it up and rub it smooth?
Welcome to borrow mine mate, look forward to see the outcomeI'll have to borrow a heat gun to try that. Expect photos of burnt plastic in a few weeks lol.