This section is from the book "Spons' Mechanics' Own Book: A Manual For Handicraftsmen And Amateurs", by Edward Spon. Also available from Amazon: Spons' Mechanics' Own Book.
Do not mix the gold size and powder together, but go over the article to be gilded with the size alone, giving an even and moderate coating. Let it dry (which will not take long) till it is just sticky, or, as gilders call it, "tacky." Then over a sheet of smooth writing-paper dust on the dry gold powder by means of a stout, soft, sable brush.