I never had a problem with the camo look of the burn the candle leaves. Use cooking oil with the candle dose not leave as much use'lly what it dose, sand the little it leaves. Use a sero with a wick no black candle smoke. No matter what to use if you over heat it leaves a burnt mark.
I make a mold the go's over my heat guns nosile. Which narrows the heat down to 1/4,1/2 inch. To keep from takeing out close beens you just straighten. I also use cooking oil just like you'd on beening staves. I found out useing it seams to heat up fast helps with black marks with breakage and helps with memory.