Dglass Coat works by forming glass layers that greatly strengthen the surfaces they are protecting.
Dglass Coat is basically a fine, mineral silica. When rubbed onto a surface, as the particles are micro size, they can seep into the small, uneven contours of the glass. When water is then applied, it acts as a catalyst that causes chemical reaction with Dglass Coat which forms a thin layer of glass 0.2 ~ 0.3 micrometers thick.
Even though the layers are thin, the fact that they match the contours of the glass strengthens the surface more than the coating would otherwise. As other glass protectors only rest on the top of the glass and do match its contours, they are less effective.
In addition, coating the peaks and valleys of the glass rather than just forming a layer on top makes it possible to give the glass added strength with more layers of coating.
With three layers, the surface should have the strength of 9H tempered glass. Adding more layers will give it more strength. However, even with more than three layers , the coating will not affect the operation of touch-screen devices (a phone was once tested with over 30 layers without operation being affected).
As Dglass Coat is inorganic, it is not affected by ultraviolet rays, will not break down and will last as long as the surface it is protecting.
The coating will not only make the surface stronger, but it will also make it more resistant to dirt and easier to clean.