painting portal/retaining walls - Model Railroader Magazine

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I have tried a couple of different methods, but the one I like best now is to use Rustoleum's speckled paints, particularly the one in light brown.  This gives both an uneven texture and a lot of color variation.

(Click on the picture for a larger view.)  I did not treat the casting beforehand - just sprayed on the paint.  After it was dry, I used a thin solution of India Ink in water, and brushed it on.  I do that to highlight the deep spots and cracks in the casting.  Sometimes it takes a few applications of the India Ink mix, but usually two is enough.