I am wondering the same thing right now. I am building a hypothetical F-16XL as a wild weasel.
Do a search for Have glass V paint. I found an article on a way using Alclad as a base for a mixed Tamiya/alclad topcoat that should work. I assume that if you painted the base metal colors in the camo pattern and then painted the overcoat with the gray it might work.
This is the thread which explains his method:
http://www.intscalemodeller.com/viewtopic.php?t=15860
I am looking to give this a try in the next week or so, hopfully it works.