Gundam marker for ink drawing is super thin for painting engraved lines, and they can give you a more mechanical looking finish. Paint run off can be erased with a rubber eraser. The marker fixes really well, so it is extremely easy to use. 3 colors are available, so you can use them for wide range of purposes.
GM01 Black : For parts with dark colors like blue and gray
GM02 Gray : Optimum for white parts
GM03 Brown : For gold plated