After wiping off the excess paint to color the grout in between the bricks I glued the acetate on the window frames and doors.  The reccomendation from most sources is to use some form of white glue to hold it in place, but as I intended to weather the building so that the glass would not really be clear anyways, I used Zap-a-Gap.  This allowed me to install the “glass” much faster than using white glue would have done.  Here is a picture of the building after all the windows and doors had been installed:

The next step was to airbrush a layer of dirt on the building.  Unfortunatly for me I did not thin out the paint far enough so it ended up leaving some rather large splatters.  This ended up working out in the long run as I then used chalk to blend everything together.  Here is a picture showing the roof with one side showing the airbrush and the other showing the chalk blending it in:

I also used chalk to blend on the rest of the building, using a piece of sandpaper to grind the chalk into a fine powder.  I usually use a couple of different colors and use the application brush to blend them.  Here is a picture showing work on the walls of the building:

As you can see in the picture, I also used the chalk on the windows which had the effect of making them very hard to see through (just like most industrial buildings that I see in Oakland, CA).

After doing a little research I found a couple of different techniques, the best of which I found on the NMRA website.  This technique was to paint the walls a brick color, using an airbrush.  Once that had dried I mixed up a batch of watered down white paint.  I brushed this over the wall, covering about one third of the wall.

After allowing it to dry for about one minute I used a rag (an old T shirt) and wiped off the majority of the paint.  This had the affect of removing the white paint off the bricks, leaving the white in the mortar lines.  I was  very pleased with the look, especially considering how quick and easy it was.  Here is the picture of the results:

As you can see it is very bright, but I intend to airbrush and use chalk to complete the look.