Blending multiple PostProcess materials

Hello.
I would like to ask how can I blend multiple postprocess materials? I have materials that I need to blend together however if I put them over each other the first one always overlaps the others. I was also trying to use multiple PostProcess volumes and setting the “Blend weight” for all of them to 0.25 still only one material was visible.
Thank you.

Bump bump.

I also need to bump this. I have a pulse effect that I want multiple of but the newest one is always the only one shown

I believe this should do the trick

It’s due to an “optimization” of unreal engine. It just blends material parameters instead of stacking the effects. I made an unreal modification to the engine that I’m selling here if you’re interested : UE4 Modification : Stackable Post Processing Materials