The Green Gundam Marker is an easy alternative to brush painting. Each Gundam marker has paint inside that are design to go directly on the plastic model. Gundam markers come in various sizes and colors make them perfect for small detailing to paint whole parts. To use the markers, the pen needs to be shaken so that the paint inside is mixed and then pressing down on the marker time several times to allow the paint to flow through the pen nip. Since Gundam Markers are basically like paint, sometimes they need to be coating a few times for and even looking paint job. It is recommended to let the paint cure for a few hours and topcoat it.