How can i invert only mask effects without inverting the mask itself in SP?

Sani

Hi, using substance painter, I created a fill layer, added black mask to it, added paint effect to the mask and now i want to invert only this paint effect, so i tried to add invert filter/levels above it, but they inverted not only paint effect, but also mask itself. How can i invert only paint effect without inverting the mask?

Benjammin

Put the paint effect on a different layer, place it somewhere below everything (it doesn't need to be visible). Add an anchor point above it. 
Add a fill to the mask where you want to invert it. Point the fill to your anchor point, then invert it in the fill level controls.
If none of that makes sense, go and research Anchor Points - they're an excellent tool to understand.

Sani

When i'm using fill level controls it also inverts original masks's background:

Benjammin

I mean yeah, that's how inversion works.
Just paint out the white you don't want.