This is a great question. A lot of work has gone into the design and production of NanorOx. I'll explain in detail the materials and how each NanorOx is made here. My hope is you will enjoy learning about the process and feel confident in the materials used because let's face it...if NanorOx aren't safe for your reef, then what's the point? So, let's get started.
NanorOx are cast, painted and sealed in 100% reef safe materials. The resin used is Smooth Cast 305 by Smooth-On. Each NanorOx is then airbrushed with water based acrylic paints and thoroughly cured. Finally each NanorOx is sealed in an epoxy encapsulant called Tarbender - again by Smooth-On
Why do we seal NanorOx?
NanorOx are sealed in an epoxy encapsulant for two main reasons. First, saltwater is very harsh on just about anything. If left unsealed, the beautiful colors would eventually fade, flake, etc. To some folks this may not be a big deal since coralline algae and other things will be growing over the rocks and the resin itself is colored purple but we want to keep the vibrant colors in tact as long as possible. Second, and most importantly, we seal NanorOx to further strengthen the rox so they are literally rock hard so snails, urchins and other cleaner crews don't scrape away the outer surfaces.
By the way, you may notice that NanorOx always look wet. That's completely normal. The epoxy sealant is glossy when dry (chemicals that make sealants matte are toxic and NOT aquarium safe) but once you place your NanorOx under the water the shine will go away.
The Power of Magnets
We use the most powerful magnets available and not just one but TWO in each NanorOx. Many other magnetic racks use metal plates within the rock material and then a single magnet on the outside. We use opposing magnets so NanorOx hold on to the glass from both sides!. Don't worry about rust either because one magnet is completely incased within the resin and the other outer magnet is sealed in a strong plastic coating so you can place your NanorOx almost anywhere.
One word of caution here...our magnets are not toys and can pinch your fingers if not careful. Also, take care when installing your NanorOx. It's not a good idea to let the magnets slap together against the glass. Aquarium glass is very strong but there is no point in taking a chance. When you install, place the NanoRox and the outer magnet against the glass away from each other and then slide them together.