This might help too - a detailed research o Kriegsmarine colors and uboats:
http://amp.rokket.biz/reference.shtml
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U-BOATS: Kriegmarine U-Boat Colours & Markings (PDF 1.2mb)
Written with the U-boat modeller in mind, this detailed article attempts to cover everything the modeller needs to know about painting their model U-boat. Included are standard Kriegsmarine paints, upper and lower hull colours, camouflage schemes, insignia, tonnage and tactical markings, draft markings, wooden deck colours, and the colours of small miscellaneous parts. Federal Standard references are given for all Kriegsmarine paints, as well as matches for six ranges of modelling paints.
The original version was published in the September 2004 (#58), December 2004 (#59) and March 2005 (#60) issues of the SubCommittee Report
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And John at WEM is right, the WEM paints are PERFECT, go with those they are not expensive!
AMP - Accurate Model Parts
Fabric Flags, AM Uboat Goodies & More
http://amp.rokket.biz/