Sledhead, I have found that once a clearcoat has been applied, weathering chalks adhere very well without additional overspray. I had the same results trying to seal my weathering, and have found it's not necessary. The clearcoat helps the chalk adhere to the model, and the chalk can only be taken off by gently scrubbing with a stiff, damp brush.
The line is located in Plaster City CA, a "city" in name only. The nearest real town is El Centro I beleive.
It's funny you mention a workers' drovers caboose. USG actually had exactly that. Though as dirt roads "improved" they did away with it. I'm not sure if it still exists. In the critters/rail cars section there is a thread about a behemoth of a railcar they built that preceded the caboose.
Last edited on Sun Sep 4th, 2011 06:52 pm by sledhead
Well, a little bit of news on the white dust route. I've had trouble getting the dimensions and details right as I develop CAD drawings of my hoppers. So, I decided to go to the source, I contacted Trinity Railcars and USG for help, I've heard back from USG so far, they've got someone looking into possibly getting me some drawings. that would be really cool if it happens, to say the least.