THE BIT THEY DIDN'T PUT ON THE BOX.
Ten times the liquid. Same bicycle? Maybe not.
Premium cycling brands market specialized "wet/dry weather ceramic chain lubes" for £12–£18 per small 50ml bottle. Chemically, the formulas match the physical properties of industrial dry-film PTFE lubricants used for manufacturing conveyor belts, which sell at industrial supply warehouses for £8 per 500ml aerosol.
SO WHAT'S THE CATCH?
Different formulations and quantities; suitability for bicycle chains is not established.
THE INTERNET DETECTIVE'S CHECKLIST
Look for complete part numbers and revisions, make sure you're comparing the same quantity, and check the exact model/application. That's especially important with electrical, braking, steering, battery and other safety-related components.