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I called Apexi and that was what they told me...
No spray if the block and head have been decked. I figure it is sort of like when you take two panels of flat glass and twist them together, they create a tight seal. No need for a sealant between the two. Metal with a smooth surface finish acts in a similar fashion, and the apexi head gasket does appear to have some sort of very thin coating (maybe electro-plated?) on the two outer (the word escapse me right now but...) "sandwich plates."
I, personally, would be inclined to use copper spray if the surface finish was course or scratched somewhere though.
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