Once you have the U.V's completed you Save .
Now load the saved .obj back into Maya and you are done.If you want you can now save the newly UV'ed model in Maya as an .mb or leave as an .obj if you need to take it into Zbrush or 3Dpaint or something .

If you want to create you own textures then select your model and bring up the UV Texture editor, simply click on UV snapshot on the menu and save your UV layout in the size you want your textures.Now you can load the snapshot into Photoshop and using either multiply or screen as your blend mode (depending on layer position)paint away and create any texture,bump,reflection or specularity ect maps you need.

Originally Posted by jsprogg