Best fuel for molotov cocktails is diesel. Spreads flames and doesn’t explode in your face as soon as you light it.
if you only have gasoline, and alternative method is to get some styrofoam and mix it with the gas until you get kind of slurry/gelatin. This is essentially napalm - well lets just call it for what it is: its actual Napalm. Don’t get it on you. It is sticky af. You cannot put it out either until its done burning. I think there is enough O in the styrofoam to keep it going even submerged. Very nasty but effective. It also will not explode as easily if mixed properly, so safer than molotov with gas (if safety is a priority).
I would reserve these remedies for only the most stubborn wasps. Basic brake cleaner is super effective without even lighting it! Go with that first.