I have been putting-off annealing my aluminum trim so I could get a compound bend. I remembered a little trick that helps let you know when you've reached the right temperature instead of watching for an orange flame.
If this is old news forgive me, but I didn't see it when I searched the archive, though I might have just skimmed over it.
I am using 1/16" thick 1/2"x1/2" aluminum angle frome Lowes. Light an ordinary candle and run the flame under the aluminum to lay an even coat of soot on the surface. Then use your propane torch to heat the aluminum just until the soot disappears, then let cool. I did it tonight and the angles bend like butter. I was pleased with the results.
Now, get back to work.
Mark