Then after that i used black aquarium silicone. With excellent longevity, a fairly low cost, and a. Web this article will explain the process we use when building a custom polyurethane & silicone based vivarium background.
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Web i used the great stuff expanding foam, and used a razor scraper all along it to get rid if the shiny surface and give it a rocky texture.
I normally do the old fashion great stuff, silicone and eco earth look but i wanted to make it look a little.