u/Due-Werewolf-5825

I want to clean up the lines on the mafex blue hush batman and fill in the lines on the recent metallic spiderman reissue. I got the Batman from someone on marketplace, I got scammed and he put the original release in a reissue box with qc issues. I didn't realize at the time since it was my first time buying a mafex figure. I just had paint rub on the spider man in the lines. I'm just curious if there's a specific paint I should be using Or painting techniques. Any help is appreciated. Thank you