I used to have the same ignition problems with the mag bar..until I remembered some dumbass trying to burn down the plant where I used to work. He "threw" grinder sparks into a drum of Mag/Steel dust (PITA to put out).
I "slice" off a pile of little flakes of mag, then use the file on my Leatherman to saw off a pile of "fine grain" material. Mix the two piles together. The fine material ignites more easily, which in turn ignites the bigger flakes, which burn hotter/longer.
I "slice" off a pile of little flakes of mag, then use the file on my Leatherman to saw off a pile of "fine grain" material. Mix the two piles together. The fine material ignites more easily, which in turn ignites the bigger flakes, which burn hotter/longer.