Mask line question

Hey guys . I recently had my 68 cuda painted. Seeing I had the engine bay already painted, I told the painter to not worry about engine bay, all things considered I am happy with the job, one thing I am not happy with is the mask line all around the fenders / cowl perimeter. The correct way would have been open hood and paint complete fender and to cowl lip.
But it is what it is. So now I have a good mask line and also for some reason a primer line . The car is a driver, so looking for any ideas ?
Thanks

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