Mont Marte Leafing Size is a non-toxic, water-based gilding adhesive. The adhesive stays open where extended tack time is required, it dries to a translucent finish and cleans up in the water. It can be used straight from the bottle with no dilution on porous and non-porous surfaces, including wood, plaster, glass, metal, leather, and canvas. Proper tack will develop in 25mins at normal humidity and it will stay open for 24hrs.