Be very careful.
The "cheap" gold leaf is really imitation gold leaf, and is not want you want. I'm not sure what it's made out of, and it does have some non-metal material in it that holds it together. It could be as effective as putting a (very) thin sheet of plastic between the CPU and the heatsink.
A sheet of real pure gold leaf (A4 or US letter size) can cost upwards of $40US.
I investigated this a while back, but didn't have the gumption to front $40US for a sheet of the real stuff.
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