Mainly used for heather honey, I believe.
This week Lidl and Aldi will be selling hot air guns for £9.99
Used very quickly on 'dry' (white) cappings, I think it is a wonderful method (for 'normal' honey). Only drawback is no prime quality "cappings wax" for making cosmetics, etc
Just put out some newspaper to catch the wax spatter (the cappings should be blasted outwards), be quick, keep the very very hot gun moving … and don't even think of using it on 'wet' (semi-transparent) cappings - you'll heat and spoil the honey, because there isn't any trapped air to explosively expand on heating, and the method just doesn't work.