Yes, it is sculpted foam, but I don't use grout. After the carving process the foam can be heated and shrunk with a heat gun. this gives the foam a crisp outer shell. then i paint with primer, then a three color wet blend of exterrior paint. I keep snakes, for snakes this method works well and eliminates weight that grout would add to the cage. for lizards who each have 20 sharp claws grout would be recommended. Kevin

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