Decades ago I got introduced to Dri-Slide. This is a dry film Moly disulfide lube in an evaporative carrier fluid. Goes on wet, dries to a dry film. Doesn't collect dirt or powder particulates, resists water/rust, isn't affected by temperatures and seems to get into the pores of the metal.

You might have to go to folks who sell industrial lubes to get it, but it's worth it. One caution: when wet it can stain clothing.