From the Measure 21 description at shipcamouflage.com
http://shipcamouflage.com/measure_21.htm
Vertical Surfaces:
Navy Blue 5-N All Vertical surfaces without exception.
Horizontal Surfaces:
Horizontal surfaces, Deck Blue, 20-B.
Wood Decks.
Wood decks except on submarines and carriers shall be darkened to the color Deck Blue. Deck Blue paint shall be used in lieu of stain for this purpose.
Canvas Covers.
Canvas covers visible from the outside vessel are to be dyed a color corresponding to Deck Blue.
Notes:
The camouflage painting need not be exact or carried into corners. Small gear, wires, rigging, and areas permanently in shadow, as under boats, etc., need not be painted with the camouflage colors. There is no objection to exact or careful painting which may be desired for the sake of good appearance at close range.
All bright or shiny objects, no matter how insignificant, shall be painted, covered, or removed.
Glass windows shall be covered or removed, especially during the day in sunny weather, and at night when anticipating searchlight discovery. Insofar as conditions permit, similar precautions shall be taken on airport lenses.
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So, all boats, liferafts, gun barrels, etc are to be painted/stained/dyed to the color of 5-N.
The 20 & 40mm gun breeches would not be painted -- they would be left in dark parkerized gun metal.
Since the material & efforrt to paint a 1:1 carrier could not be completed from one can of paint or in one day by the painting crew you may choose to vary slightly the final hue of the paint applied to different areas to help break up the monotone blue appearance. Drybrushing with a lightened 5-N will likewise help.