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Being in the thick of layout-building, I will share some very recent experience. ( I think I have commented on this in a previous thread). Great Stuff foam is a wicked cement. I have used it both to glue track to foam insulation board and to glue 2" foam slabs together to make foot-high moutain ranges. I also used it early-on to glue my blue foam roadbed to my OSB sub-roadbed. I use it because it is the best thing I found. It cures fast and won't let go. But I think it is too expensive to waste on filling voids. Besides, it expands uncontrollably. Neither is it a good choice for visible surfaces. It does not make realistic-looking rocks or anything else. Just today, I was filling in the spaces around my curved facia boards. I used wadded newspaper as a base, then filled in with colored plaster. If you want to fill spaces, colored plaster is both the cheapest and the most versatile solution (IMO). Anyone want more info on colored plaster, ask. <br />Bryant
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