Tools and materials:
Gold leaf kit (got mine at Hobby Lobby) with gold leaf, adhesive, and sealer.
Arrowhead (Here's hint for finding a replica arrowhead: try a museum gift shop. I volunteer at the American Museum of Natural History, and the store there is chockfull!)
My arrowhead was already wrapped with wire, thanks to my grandfather, but I recommend wrapping after you cover the arrowhead with gold leaf.
Apply a coat of adhesive and let dry at least 30 minutes until tacky, according to the adhesive's instruction.
Apply the gold leaf. Don't worry about bare spots-- just add another coat of adhesive, let dry, and apply more gold leaf. Repeat on the back side of the arrowhead.