Now water boils at 360 degrees and hot melt melts at about 250 degrees.
Dude, water boils around 220 degrees, probly hot enuf to soften the hot melt but not enuff to hurt the arrow.
Anyway, I glued them in using instant fletching cement, crazy glue more or less. Maybe I'm nuts but I fletched 3 with 4" shield cut feathers to try out. Any reason not to use feathers on carbon, besides nobody else does?