i like to angle my gun at my fade point. i'll keep the gun at 90 degree till i get to the point i want to fade, then i'll go20-30 degree w the gun and paint my fade point at that area.
if i want a fade to where you don't see a fade line. i'll mix my paint 50/50 for each color, start in the middle and go the opposite directions
red/whatever else color (just be carefull you don't mix it w/ white=pink)
100/0--80/10--60/20--50/50--20/60--10/80--0/100
something like that.