Abstract: A fluid applicator for applying fluid to a surface has a reservoir for fluid. An outlet from the reservoir leads to a roller assembly comprising at least two rollers which are arranged to roll over the surface to be marked so as to apply fluid from the reservoir to the surface in a single line. The roller assembly is removably mounted between side frame members and the surface of each roller is framed by a peripheral sleeve of an absorbent material. The sleeve can then be removed from the applicator for renewal or cleaning.