Material Parameter with two different values.

Hello everyone,

I am learning the Unreal Material editor. This my first post.
I am creating a material and I want that from one parameter I can make material look with wet. I have a parameter called Wetness which I am using to change roughness and to make diffuse darker and to increase the water level.
But How can I use two different values for Wetness parameter? Is it possible? At one place I want the default value of Wetness to be one and at another place I want the default value to be zero.
many thanks.

Okay, inverting the wetness worked.