al,

This is food for thought. You better have a tight sealing
container, because baby oil, mineral oil, most oils, will
find a way to leak out of a container.

Generally, I would expect that lighter, thinner, hydrocarbons
will ignite easier; but they will also escape a container easier.
Example: lighter fluid will evaporate out of a Zippo-type lighter.

Maybe you could seal the oil/cotton in a piece of plastic straw,
just like some guys do with petroleum-jelly/cotton. They seal the
straw end with heat, so be careful not to burn yourself if you do
decide to experiment.