Aqualok is a product that is suitable as a replacment to most urinal barrier liquids.
Aqualok has a lower viscosity than water, and so floats. It allows urine through and forms an impervious barrier to keep odour out of your washroom. Aqualok is designed to be used in waterless urinals that have a cartridge design system.
It is simply poured into the urinal after the trap cover is in place.