On my micro layout I have some areas that need to be filled in like gaps and smooth areas out. What material would be best to use for indoors. Normally outside I would use dirt. I was thinking plaster or is there something better that weld work preferably around the workshop item like Caulk. Any ideas.
An example is where I built the wall on either end of the trestle. I want to build it up some and the gully walls. I want to create smoother transitions.