Doug,
There's speculation as to whether or not the Hornet had Norfolk 250N or 1942 Flight Deck Stain 21. In laymen's terms, the 250N Flight Deck Stain, 1942 version, was a very very dark gray with a hint of blue in it...and Flight Deck Stain 21 was very close to modern day FS#35164. Flight Deck Stain 250N has no real FS# equivalent, so your best bet, if you have access to Testor's Model Master paints, is to get the actual 250N color. In theory, 250N is supposed to match 5-N Navy Blue....but it doesn't match up against the color chips I hold (actual WW2 USN chips).
I would suggest contacting White Ensign Models in the UK, as they have all of the proper colors for USN WW2 paints. They ship worldwide, and have a special SR-71 delivery service that gets things to the East Coast of the US within 3-5 days...colors for Hornet will be the following:
5-N Navy Blue
5-O Ocean Gray
5-H Haze Gray
Norfolk 250N Flight Deck Stain
Norfolk 65A Anti-Fouling Red.
At the time of Doolittle Raid, she was freshly painted, so weathering should be kept to a minimum.
Regards,
Jeff Herne