Drip half of your brush into the adhesive, known as size.
Apply a thin coat of size to the box. Spread the size evenly across the surface.
Allow the size to become tacky and sticky to the touch. The surface should become tacky in approximately 90 minutes.
Align a sheet of aluminum leaf with the bottom edge of the box.
Apply the leaf to the tacky box with your fingertips. Continue applying aluminum leaf until the box is covered.
Dip your brush fully into a small container of mineral spirits to clean the bristles. Dry the brush.
Apply a thin coat of oil-based varnish with your brush to the surface of your newly gilded box. The varnish will protect the surface from moisture and air.
Allow the box to set for 24 hours for the leafing to cure.