How do I use micro skins sbar file with brush mode?

[TronLee]

So,I download a micro skins ,Skin Crust Wound, at "susbtance source ",and import it in substance painter as basematerial ,right?
and I add a fill layer ,then fill it with Skin Crust Wound as basematerial. but it with cover all my previs material,what I want is only the wound part ,how should I do?

[Jeremie Noguer]

Create a black mask on your fill layer and paint in only the place where you want the skin detail to appear.