The way to apply the PP is the same than before, just has changed the property in the material. Check it out if you still have setted up the blendable in the PP settings (camera or PP Volume). If I were you I’ll change the Set Render Custom Depth like a function in the class, cleaner and easier to check were is your error, instead of get component by class just take the Static Mesh Actor component in the class, I place for you a nice example, just center in the highlight porpouse, leave the rest for your case.