While carrying a cupboard door to reinstall, my husband accidentally scratched a gray line on the door with his belt buckle. We were using "Advance"-brand paint.
How can I get this off without ruining the fresh paint?
Touch the paint up with a tiny dab of paint and a small brush. Paint takes about a month to cure, and little touch up jobs like this should blend right in by the time the paint finishes curing.
Assuming this is a scuff, and not a deep scratch, Magic Eraser will surely get it off. This thing does wonders, it should be part of everyone cleaning supplies.