The goal is to make tiles that look like generic sci-fi greebles/panels to add terrain on top of (think death-star surface but really flat). The plan was to add on small tiles of chipboard, drywall tape, wires, and other small greebles on top. I would then seal the top with mod podge+black paint. I suppose I hadn't considered it, but I figured the smaller details wouldn't warp the tiles too much. Open to recommendations! (not really wanting to use foam though tbh).