A paint brush is an item used in construction.
The paint brush is used to plaster a player-constructed wooden wall.
A plastered wall, whether player-constructed or not, can be painted using paint and the paint brush. Symbols can also be painted on plastered walls and other surface types, such as wooden signs.
Paint brushes are used to paint a plastered wall.
Paint brushes are usually found in crates.
From items.txt (Project Zomboid directory/media/scripts/)
Weight = 0.2,
Type = Normal,
DisplayName = Paint brush,
Icon = Paintbrush,