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I am looking for a casting material for a mold made from a textured sheet Answered

I made a latex mold off a piece of textured sheet.  The mold is 24x24x1/8 inch. 
I want to make castings that are flexible and paintable, so I can make "sheets" I can shape into roads for miniature terrain.

I have heard there are paints or surface finishes that will work for this, and if this is true, I'd like brand names from US sources.

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Not if you paint them with a release agent. It's actually worth trying in a safe area because I doubt it will stick to the latex anyway - depends on a lot of variables.

Grease, oil various propriety release agents may work.

Never done this but I would try standard acrylic paint - Or here are thick paints available that are used to cover over cracked ceilings.

There are vinyl paints available that could be used for the purpose. You'll have a curing time to deal with, but the output should be flexible. I am guessing, but I suspect that coloring agents could be added to the paint to save the second step.
I don't have any brand names to share, but you might find what you need by checking with the major manufactures.