I would suggest that you send your question to the technical
department at Daniel Smith Artists’ Materials [www.danielsmith.com]
as they carry a full line of metal foils, glues, burnishers,
brushes, and all the other tools you need for gilding. I suspect
that all you will need to adhere the foil is hide glue [a.k.a.
rabbit skin glue], which is widely available from fine book binders
as well as traditional gilders. Here in the US gilding – the
application by adhesives of layers of gold leaf to all kinds of
surfaces from paper mache to wood to base metal – was nearly a lost
art. But recently it seems to have experienced a bit of a revival,
particularly in the architectural restoration field. Painters have
also gotten interested in the use of metal foils of all kinds, which
is why Daniel Smith carries the supplies.
Bear in mind that gold leaf is much thinner than gold foils used in
enameling and will give you quite a different textural effect. You
could actually emboss, draw, or otherwise pattern foil before
sticking it down, just the way you would for bastaille enameling.
Gold leaf is too thin and fragile for that.
hope that helps,