Blurred Outline

I am currently working on one of my Epic GameJam games and I wanted to upgrade the way we were handling our background.
Currently I am struggling with achieving effect like on the picture but instead of using ‘hacked’ atmospheric fog I want to use outline with blur.

Outline works nice but the issue starts when I want to add blur pass to it. Seem like using RenderTarget is not a valid option to hold Outline texture (from first pass) for the Blur pass, it will make the screen black.

Does anybody have an idea how to go around it (GBuffer?) or how to achieve this effect with PP? I am using 4.10.

Any tips greatly appreciated!
Cheers :wink: