Some of these might help you. http://wiki.polycount.com/TexturingTutorials Don't use the same tiling texture across the whole surface. The details should follow the curves of your ship. Closely study some reference material, for example:
Better! Now grunge it up and add more details. Some examples to give you an idea. http://www.polycount.com/forum/showthread.php?t=48285 http://www.polycount.com/forum/showthread.php?t=99754 Hard Surface Texture Painting by Stefan Morrell