I use all sorts of things depending on the result I want. Walthers works very well and is consistent. I also use acrylic paint for varying shades. Best to do a test spot. They look a total different color wet and dry.
Some buildings I want the look very older brick and white buildup on some brick surfaces. Sometimes I want just a very thin mortar. Best thing is my feeling is when you screw up thsts fine too. Do a search on google for brick buildings, out in the real world they vary tremendously.
