The paint is pretty hard and it takes a while to make an impression in the runs, I found that using a strait piece of wood about 3 inches long made the best work of it.
Its pretty hard to not rub through to the metal, so I am going to scuff the entire wing with 400 grit paper to dull the paint and then spray the bare patches with etch primer and then apply a light coat of white while the etch primer is still wet so to speak and then follow this with another coat of white over the bits that I rubber through and then see if I can give the entire wing a final coat.
Just to make my life mroe interesting I am going to paint the wing in the vertical position this time......