Hi Mikkel,
Gold leaf isn't **that** cheap - I usually pay around £15-18 for a book of 25 leaves at 22 or 23ct. The Ebay stuff says that it's 24ct 'on a base' so I guess that it's some kind of electroplated foil, hence the cheapness.
Application is a bit of a dark art. Essentially you paint whatever you want to gild with a suitable size (usually a quick-drying oil varnish, but you can use gloss paint) & then wait for it to become just tacky enough for the gold to stick. Judging the tack is the tough bit - too dry & the leaf won't stick, too wet & the size layer will shrink under the leaf and cause it to wrinkle; the only way to figure it out is to experiment & learn by making mistakes. There are water-based sizes that dry as a tacky film that doesn't go off, but I have very little experience with these.
Another solution might be to use Bronze Powder. These come in a variety of shades of silver, gold & copper. Application is a lot easier than gold leaf as the amount of tack isn't anywhere near as critical.
For sprays I've had good results from the little 100ml rattle cans of Plasti-Kote. 'Antique Gold' is rather coppery.
Pete S.