I have done the gold leaf sky and here is a little tutorial for you. After watching Youtube videos and talking to the staff at the art supply store, here is what I have discovered and done today. I started by applying a thin layer of glue, called ‘size,’ and waited until it was tacky and did not come off on my fingers when I touched it (it dried much faster than the 60 min recommendation on the label). I carefully placed the gold leaf on top and brushed off the excess with a big soft brush. In the fifth picture you can see how it is cracked and has ridges, but when the light hits it right (last photo) it is completely shiny and hides the cracks.