The built up letters with direct and/or halo lighting and metal sides are produced under a Soleneon Service S.r.l. European patent. The expansion joint between the acrylic face of the built up letters and the metal side is watertight (European patent).
The combination of the face protruding slightly beyond the side and watertight joints guarantees any rainwater runs off immediately, leaving the face of the sign perfectly clean.
Other example of application: built up letters with direct lighting, created with metal sides, acrylic faces and upon digital printing or traslucent adhesives.