Shellac is a waterbased bonding agent for gold leaf. It stays wet for more than 12 hours when applied on the base of acrylic color or acrylic sealer. Non toxic. Non flammable   reference: www...

Mona Lisa Metal Leaf Adhesive is a waterbased brush on sizing that becomes tacky in 15 to 60 minutes depending on weather conditions. Specifically designed to stay tacky up to 48 hours. Can be use for other craft and home...