after wetsanding a touch-up painted area with 2000 grit paper, i have foud that some area shows a different black color (greyish) from the rest of the black paint even after i have polished the sanding marks away. i suspect that i have hit the primer. is there any way to fix it?



should i touch it up again and wetsand again with a sanding block?



or should i mask and spray it? if so, how can i remove masking lines after the spray paint dries?