My other creation with expanding foam. Last post is here. I had the same grout problem and am now layering it with paint. I'll be coating that in polycrylic, then spreading sand on the parts that are supposed to be rock to provide some grip and cut the awful shine. I've found the idea of using epoxy resin to coat instead of the polycrylic, but it has an awful shine as well. I think I just need to be more liberal with my sand application.
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