How to draw on top of a shader applied to camera

Hello,

I got a shader applied directly to the camera (used for Fog of War). I would like some object shader to be able to draw themself on top of that shader.

I'm a bit new to shader programmation. I tried messing with ZTest/ZWrite and "Queue" tag but nothing allowed my shader to render on top of that Camera/Fow shader : /

My FoW shader use:

 SubShader
 {
     Pass
     {
         ZTest Always
         Cull Off
         ZWrite Off
         Fog { Mode off }
         CGPROGRAM
             frag/vert function blabla
         ENDCG
     }
 }

My object shader use:

 SubShader
 {
     Tags{ "Queue" = "Overlay+1" }
     Pass
     {
         ZTest Always
         Cull Off
         ZWrite Off
         Fog { Mode off }
         CGPROGRAM
             frag/vert function blabla
         ENDCG
     }
 }

Disabling [ZTest Always], [Cull Off], [ZWrite Off] or [Fog { Mode off }] on the FoW shader didn't helped, the object shader is still invisible

Any idea, input ? (Would be greatly appreciated =^) )