Abstract: A moistening apparatus for moistening a form sheet. The apparatus includes a body having a trough in its top portion and a reservoir in its lower portion. A capillary tube connects the trough with the reservoir and a roller co-extensive with the trough, is mounted so that its lower portion is substantially surrounding by the trough. The apparatus is connected to a source of fluid by a gravity feed. The fluid level in the source varies between a predetermined upper and predetermined lower level such that at the lower level, fluid is always maintained in the reservoir, while at the upper level the fluid does not rise substantially above the bottom of the trough. Thus, a meniscus of fluid is maintained in the trough only by capillary action. As a form sheet moves transversely across the roller, the roller rotates through the meniscus of fluid and a sheet of fluid is transferred to the form sheet to moisten a previously applied remoistenable glue on the form sheet.