Landscape Material Blending Textures

Hello, i am wondering how to make the materials on my landscape paint heavy in some parts and then need constant painting on the same place to bring the rest in?

Like in the video i will link at the bottom, the person starts painting but not all of it comes through unless he paints over it again. Looks like a really nice detail to help blend different texture together.

I’m not sure if material blend is the right term because i can’t seem to find anything on this.

http://puu.sh/yJarq.jpg - This link shows exactly what i mean how the snow is coming through in parts.

HordeCore | Show Casing our Blending Material Unreal Engine 4 - YouTube - The video this image was taken from.