After the clay is fired (if it needs to be fired. Apoxy sculpt can set after 24 hours in open air), you want to grout it, then paint it as desired with acrylic paint, and seal it with a water-based sealant. I don't remember which kind of grout at the moment, but @MissterDog has done some pieces for her ball python and probably knows the process better than I do, as well as specific recommendations.
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