Thanks!
I spent about 5 months - a couple of hours 2-3 evenings each week and several hours every other saturday. The buildings are mostly balsa, bass plywood and poplar dowells. I struggled with finding a way to get a stone-wall look surface on flat and curved surfaces. I wanted it to look the same whether it was smooth PVC or grainy balsa wood. I ended up pouring room temperature vulcanizing mix on a sheet of stone texture styrene to make a big, rubber “stamp” that once cured, I laid flat on a table. I then spread embossing ink (from the scrapbooker’s section of Michael’s Craft Shop) on the rubber “stamp” with a roller and then pressed (or rolled if cylindrical) the model part on the stamp. While the ink was wet, I sprinkled black embossing powder on the surface and zapped it with a heat gun. The result is a very convincing stone wall texture; the process also worked for roof shingles.
LED light test in basement: