ummmmmm. no,lol. Seriously though... if you wanna risk it, be my guest. I suppose anything is possible in this world but how were you going to cure the powder anyways? Just pre-heat via that method. Maybe if you told me what you are doing or more specifically....what you were trying to coat and what sources for heat you'd have available to you, I could help a little more. Generally speaking...you'd have to have a painfully light touch with any torch to cast aluminum though. One crack or fissure and that part is history.... big or little.
*edited* I'd also tend to think that with heating like that, you'd be putting some quick oxidation on the part as well,no? Just a random thought.