Foam core board is fine for areas that don't show, I suppose. But it often frays when cut and will warp when painted. Gatorboard on the other hand, is foam core board with a thin outer shell that won't warp, is easy to cut and takes paint easily as well. It's also structurally very rigid so it can be used for buildings, supports and anything else you can think of. You can Google it and get different sizes easily. I also use Taskboard. Very interesting material. I often use for roads as it has a very slight texture to the surface, rather than being purely smooth. It also cuts easily and takes paint well but it can warp. It's easy to get rid of the warping by weighting it down for awhile. Sometimes, smaller pieces will just flatten out by themselves. You can get very large sizes of Taskboard at Dick Blick's online.
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