Update: Why I now use gentle heat on tough adhesive jobs
I always avoided heat near car paint, worried it would cause damage. Had a van with old pinstripe tape that was stuck on good. Tried every chemical remover in the shop, but it just smeared. A friend told me to hold a heat gun back a bit and move it slow. The adhesive peeled off in one piece, no harm to the clear coat. That job changed my whole view on using heat for cleanup. Now I reach for the heat gun first on similar sticky messes.
Honestly, I used to stick it real close, like 6-8 inches away. I saw a video that completely changed my mind, though. They showed how holding it back at 12-14 inches gives you way more even heat and stops that scorching. Total game changer for getting smooth results.