Are these different than the paint stripping type of hot air gun?

Heat welding is tricky and requires
: some specialized equipment, namely a hot air gun (hair dryers don't even
: come close, but somebody make an attachment for propane tanks that is
: designed for the job). Hot air guns are obscenely expensive, but you might
: be able to rent one somewhere. Solvent welding of seams is possible but
: far inferior to hot air welding.