Pro Neat game mechanics
In one of the modes, the two teams have to paint the ground ahead of them to advance. Teams can teleport (this is the game's movement system) only onto paint of their team color in this mode.
You can equip a short-range paint gun at the cost of having another weapon, so it's a matter of prioritising the objective. Controlling more paint on the field lets your team go closer to the front lines, where better cover and the objective is for that map, but you're vulnerable standing out in the open painting.