Does anyone know where I can find o gauge cobble stone street material?
Check out Plastruct. I believe they have a plastic sheet you can use.
You might also check out dealers who cater to military miniatures modelers. They might have some useful materials.
Some modelers lay down plaster and then carve the cobblestones.
One technique that would probably work for O – and I saw this years ago in MR but cannot find the issue so I cannot credit the author or modeler who thought it up – is to take window screen material and use a pencil to round the openings and make them irregular. Then press the screen into plaster or sculptamold or spackling compound while it is thick enough to hold the shape, and pull away the screen.
Dave Nelson
Several years ago, I searched around for cobblestones and found nothing. I was specifically looking for hexagonal cobbles. I ended up ordering a single sheet of artificial honeycomb from a beekeeping place. I used that to press an image into modeling clay, and then I covered the clay with several layers of latex rubber to make a mold. From this, I cast sheets of cobblestones with Hydrocal.
My layout is HO, but these cobbles are seriously oversized, so they would be better suited to O scale.
Brawa makes small pastic sheets of cobbles, but you would need quite a few of them, and the individual cobbles are more like HO scale. I’ve made a latex mold of these, too, but I’m not up to the scenery in that part of the layout yet so I don’t know how well they’ll work.
Check the Scenic Express catalog:
Scenic express should just be on a sticky on these forums. They’ve become a powrehouse in the hobby that people are just starting to discover.