The structure is covered with the Rusty Stumps O Scale # L1502 brick sheet. I base coated the brick with a Terra-Cotta from a rattle can. When that dried I came back and darkened some of the bricks then washed the surface with some AI. I will come back and dry-brush with some Terra Cotta to lighten up the surface a bit but at this point I was pretty happy with the base colors.
One problem I ran into using the brick sheet was that I was using a lot of washes of water and alcohol base. The brick sheet is a laser cut resin coated cardstock. It’s available both with or without a self-adhesive backing. My using alcohol based washes was unfair to the adhesive on the sheet! I was happy with the brick but planned (which I did) to purchase the non-adhesive sheet and use 3M 77.
That would do two things. (1) Reduce problems from using alcohol washes from attacking the adhesive and (2) like I mentioned when covering the chimney, apply the sheet prior to assembling the building. That would mean I could have greater control over the mitering of the brick edges .. make the building conform to the mortar joints in the brick instead of trying to make the brick fit the building.