change the default wall surface?

[ag95keri]

I have modified the default materials for "Wall Covering" and "Walls (Interior)/Soffits" but all my walls are still showing up as white drywall. When I examine the specifications of a wall, under materials there are options for "Exterior Wall Surface," "Interior Wall Surface," and "Wall Covering."

Even though my "Wall Covering" reflects my updated default choice, the "Wall Surfaces" still show a default selection of "Drywall" so my walls are still displaying as white. I cannot find this setting. Anyone know how to change the default "Wall Surface" material? Otherwise, it looks like I'm going to have to open the properties for each wall and change it manually.

Thanks,
Keri