when i was refining my 'scraping' techniques i boiled down resiny-alcohol (although, in comparison, it was basicly just alcohol... lol) over a direct flame and guess what! nothing happened... just because it can cause a fire, doesn't mean it will... i'm not saying to go out and do what i did, maybe i just got lucky.... just saying, just because you are warned against something, doesn't mean if you go against it, it will DEFINATELY happen... only info i got to offer on the subject (seemed sorta relevant because of : something about putting a flame to something made out of alcohol just doesnt sound so appealing.)