Mont Marte Leafing Size is a non-toxic, water based gilding adhesive. The adhesive stays open where extended tack time is required and dries to a translucent finish.  Water clean-up.  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.