You published a video on YouTube for lubricating padlocks. You do not mention graphite powder. Do you recommend this?
Dan Hunt, London

Good question. Graphite powder is a good lubricant especially in cold weather as it works well to prevent a lock from freezing. However, in the UK it is very humid even when cold. This freeze / thaw combination caused the graphite to congeal and get sticky. On top of that, graphite powder is really messy when trying to apply to a padlock mechanism. Bottom line is that you’ll do better to use an oil based solution.