Its a gun for stripping paint, but used correctly will uncap honey frames.
And there is the nub of it.
You need to get your hot air gun fully up to heat, before showing it to the comb, then keep it moving.
The cappings should splatter off pretty much instantly when the heat hits it. (So cover the table with newspaper…)
Only use it on dry (white) cappings - never on wet (icy-looking) cappings.
I use an uncapping fork to open any cells that didn't open at the first heat hit.
Overheat your honey and it won't taste good … so be careful!
It doesn't give you any cappings wax. (Until you take the bread knife to the extracted comb and make sure it ends up flat rather than the initial waviness that the bees are likely to leave on initial frame-drawing.)
If you have an awful lot of cappings (and a tangential extractor - or a radial with tangential screens), you might consider investing in a set of 'cappings bags', so that you can spin them in your extractor.
Cappings can be piled into your double strainer, or filtered through a jellybag. But they still end up 'wet' and sticky. So you could give the wax back to the bees in a feeder for scavenging, or wash it with water for mead-making, or booze for JBM & Mrs JBM, or just go straight to the final stage of washing the stickiness down the drain (a clean pillowcase as a container can help) with
cold water, to get really clean cappings wax to start your wax-processing career.