I pulled out an old kit I had previously assembled because I wanted to fully paint it with ArtTX markers. Even within the ArtTX marker line, there can be inconsistencies depending on the brand, and the large number of colors makes finding the right shade difficult, but I found that even the white and yellow shades have strong opacity and the paint film remains durable even after multiple coats. Now, if only they would sell them individually.

Painting with acrylic markers | 髭男爵's Gunpla works