Soon to go on sale -- these N scale model railroading subway entrances (dome top) and exits (pyramid top) based on the subway kiosks used in New York city, primarily from the early 1900s to late 1950s.
I always bathe the FUD models in Bestine, a solvent cleaner that removes any residue. In the case of the kiosks, they're fairly clean so filling or sanding shouldn't be necessary. For other models, I use a very thin putty wash to fill the small grooves followed by a light sanding of the finest grit sandpaper available. As for how fragile they are....they are what I'd call brittle, meaning too much pressure will snap them. However, I've also dropped them off my workbench and not damaged them. With something like the kiosks finials at the top of the dome....that would snap off with the slighest bump.www.AmericanArchetypeModels.com