Hi, Nicole. I’ve never done the salt dough maps without baking, but I would imagine that would work. I’m just not sure how long they would take to dry completely. I would think that it would work to add wet layers to dry and build up as you go. Again, I haven’t done it that way, so I’m not sure. Your best bet would be to try it before doing it with your class to get a better idea of the time needed and make sure you don’t run into any problems. I hope that helps.