Ive been planning for a long time to paint my gunplas but living in an apartment, no chance to airbrush, so ive overspend on brushes, acrylic paints, acrylic retarder, and some thinners just now.

Ive checked my models and some of them are covered with gundam markers and the stedi metallic markers and metallic sharpies. Do i need to remove all of those first or i can go and apply primer over them?