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Teflon has to be applied to metal in a very controlled process. You can't just spray it from a can and expect it to stick. /forums/images/graemlins/frown.gif It has to be heated to very high temps in order to bind with the underlying metal. The temp required is around 800 degrees F (thus the reason that pouring Teflon bits into an engine is a total waste of money).
Here's a link I found that talks a little bit about the process: Teflon coatings