Removing UV texture lines

i use MS Paint to edit my UV exports, but because im so new to UV mapping and such i dont know how to remove the lines from the UV export?

As you can see in the picture the other parts of the car still have lines

Found out how to do it, Photoshop has an option to use layers, the layer system removes the lines because it makes a new layer when editing, so only the edit remains and the outlines are left behind on a different layer. Brilliant!

Search google for quick explanation on how to do it