Apply a Outline shader to multiple materials

I want to show an outline over a model, but this, is splitted in multiple materials.

¿How can i prevent showing the line between their connections?

If you see the image, an outline is shown between the head and the body since those are the material limits.

This is the shader that i’m using:
http://wiki.unity3d.com/index.php/Silhouette-Outlined_Diffuse
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Hey @w34edrtfg and @johnCpr
I was able to get ‘Quick Outline’ by Chris Nolet - from asset store - working on objects with 2 materials.

My fbx gameObject was exported from 3ds Max.
The import settings seen in unity needed to be as below

Did anyone figure out how to solve this!