Is there a specific strat for using the flamethrower on the resin on the fairy in the theatre? Every time i try it with 20 flamethrower ammo its always barely not enough and I don't get why.

Melting the Resin of the Gold Key with the flamethrower is sadly currently fps dependent and you need to have atleast 140+ fps to clear it with 2 Gasoline canisters (20 ammo). Looking at the stairs can help with the fps. The Devs are aware and already have a fix for this and it will come with the next patch but that might take some time since they are currently working on hard mode

Also disable vsync either via nvidia control panel or whatever amd has. If youre on console youre out of luck

no longer applies, recent patch fixed it, you can just stare directly at the resin with normal settings and it melts in like 15-20 fuel