COULD I NOT JUST MARK MY PROPERTY WITH A UV PEN?

There are limitations to using a UV pen. Pens don’t write on all types of surfaces. Some items such as jewellery are too small to clearly write your postcode on. Also, thieves can strike through a postcode, scratch or deface it. SmartWater on the other hand can be applied to virtually any item and only a small amount of it is required to recover your unique code to identify the registered owner.