The best way to blend one color to another is to "over-reduce" the blend color, then you will need to "mist" the spray toward the leading color. This will make a very nice fade.
Lets say you want to spray a yellow to orange flame job with blue metallic tips.
Spray the flames yellow, then "over-reduce" your orange paint. Start from the tips and spray the paint toward the section that you want to leave yellow. You must "fan" it toward the yellow, so the paint will just lightly lay color over the yellow. Hope this makes since to you.
Over reducing means you need to add more reducer then the paint manufacturer recommends.
Then to do the tips, you will need to do the same thing with the blue color except you will need to do it just on the tips and fan it toward the orange.
Once other thing, you should (not completely necessary though) use a slower then normal reducer since you are just misting (fanning) the paint onto the other, because you want it to melt in the other color as best as possible. This will keep your blend from looking "grainy" after you clear it.
