I'm currently playing a Brujah on Vampire: The Masquerade that specializes in melee combat with knives and swords in this campaign, he is a human who was just embraced less than 2 months ago and after seeing the effect of fire on vampires for numerous times (he passed on every courage roll involving fire so far) he decided that it would be an interesting idea to kill other vampires with a flaming sword.
My character is quite stupid (1 dot in intelligence), so he wouldn't be able to make a flaming sword by himself, he does however know of a shop that could make such a sword, my DM only ruled that I should come up with how the sword works.
After thinking a little I came up with the idea that the sword would be coated in a flammable material and there would be a magnesium flint on the scabbard that could be pressed against the blade when drawing the sword and that would produce sparks that would lit the flammable material.
I just don't know of any good flammable material that could coat the blade. My DM said that liquids like gasoline/kerosene/alcohol would just spill on my hand so I need something gooey that would stick to the blade and catch fire with sparks. If such a thing is impossible then how could I make this sword work? The fire needs only to last about 30 seconds, a minute or so at most.
I saw videos of people wrapping swords on some materials and dripping it with flammable liquids but that would make the sword blunt, I need the sword to still have a cutting edge.
TL/DR: I need a gooey material that can catch fire with sparks or another method to make a flaming sword.