I hold my heat gun 2" from the belly and move it back and forth constantly for about 6". When that is done I move out 6 more and continue. I do this all the way out the portion to be heater. For recurves I clamp the tip in the form, oil the wood well and, moving the gun back and forth I heat until gravity takes the bow down. I then clamp it and walk away. I never leave the heat gun unattended.