149th Street Harlem Station

[faraway]

.... FolkArt acrylic paints....

I do it at even less cost.
I do not know the correct terms you use I will explain therefor what I use.

Ordinary in house walls are often plain white painted. You buy it in large buckets. Lots of people like to paint some walls in a different color. e.g. the bedroom of a girl in pink (an awfully example). To do so you can buy the same paint like the white one in many colors but in smaller plastic bottles. For the girls room may be 99% white and 1% purple red.
I buy one of this bottle in black and one in white and mix my own gray. All my roads etc. are done that way. I add water to get a smoother surface. May be you have to paint two layers but it dries really fast. I add some brown if a really dirty gray is needed.