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Had a similar problem with concrete lately. I finally settled on using a light gray primer and doing a heavy wash of aged concrete paint. Both paints were from Polyscale. I just lay the piece flat and do a number of final washes until I get the aging effect I want. For the wash, I use about 90% water to 10% paint. The great thing about this is you get a non-uniform distribution of light and dark areas which is more realistic. I'll see if I can remember to take a few photos.
Tom F
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