I'm SUPER frustrated with the UVmapping in Blender. I'm also a frustrated with working with nodes which admittedly is mostly my own ignorance.
I have an object I want to be blue except for the two decals I have placed. But blue only appears on the faces that I've uvmapped the decals onto. I've marked in the photo below some locations that should be blue.
Here is my node setup.
I must be missing something.
Here is my blend file... https://drive.google.com/open?id=0B8ZnFrE6fxi_R29mZnBkXzF5dm8
I also tried this setup which produces the exact same unwanted result. It is curious because it worked for the rear portion of my Zamboni but it isn't working here.
So it seems Blender is just really arbitrarily annoying and my nodes were right. Tried to replicate the solution provided below but have the front decal wrap around a bit...
I am so pissed at Blender right now.
Ok it is working after I had the uvmap overflow the bounds of the image in the vertical direction like in the answer below and still have the decal wrap around a bit on the sides of the Zamboni. Seems like a bug to me.