If it were hot enough it would be quite dangerous as a hair dryer. In fact most quality hot air guns have a notice on them specifically saying NOT to use it as a hair dryer.
So the short answer, Not recommended.
I have a hot air gun which will happily melt solder, like max 600ºC. Never use it at that extreme. A small word of advice if using such a tool. Never use a nozzle smaller that that which is supplied with the tool. I have experienced it a few times where the nozzle size had been reduced in an attempt at a more localised air flow with the result of a burnt out element due to over restricted air flow over it.
I also have a “Portalsol” gas tool which I use pretty exclusively for small heat shrink. This has a hot air tip that will provide a quite small localised hot air stream. It is in the Jaycar catalog as TS1318. Fairly expensive but a good investment if wishing to have a more professional finish instead of burning everything in sight. It is quite convenient in operation even on a turn on/turn off basis as it is easy to ignite and heats very quickly.