pcxbox360ps3 The Burnmaster, the Nuka-grenade, and the Zhu-Rong v418 Chinese pistol are unaffected by the perk. The guide lists these as being affected by this perk, but the weapons aren't on the form list - this is most likely an oversight by the developers. The unofficial Fallout 3 patch fixes this. [verified].
Any Flamers that are brought back by the Gary-23 glitch from Operation Anchorage are also unaffected. The reason for this was probably because weapons from the expansion weren't meant to be brought back, and so no thought was given to them being affected by this perk.[verification overdue]
pcxbox360ps3 While this perk requires an Explosives skill of 60 to be unlocked, the only explosive items affected by the perk are the 40mm grenade, incendiary, the incendiary grenade and the Fire bomb. This was confirmed by J. E. Sawyer to be unintentional; the perk was meant to be dependent on the Energy Weapons skill, which governs almost all fire-based weaponry.