For a serious reflow, you need a proper reflow machine, or at the very least several temperature readings to try and make sure you actually reflow.
Doesn't matter if you use a paint gun, over, toaster, torch, 99% of the time people don't hit the proper temps.
you actually need to know what kind of solder is used to know the actual melting point of it actually melt the solder, otherwise all your doing is filling your oven with funny smells.
99% of what people call a reflow online, isn't a reflow, period. They can argue, it's not.