Just Spray paint and tape!!
I always found it funny how ToyBiz made the ugly armored DareDevil as a 'variant' instead of his much more infamous yellow costume. This one was super easy, especially since he comes apart when you take the screws in his back out!
I spraypainted the whole thing yellow first, then taped and sprayed dark red, then taped again with bright red! No brush strokes!
He looks good next to his red counterpart I think!