I use it quite a bit, I pack all of our trailer light connectors with it, and most 12v
plug-in items on the Airstream and boats that I can access (saltwater-use). Boat things like trolling motor plugs, radio, gps, other electronic plug-ins.....It does help guard against corrosion.
Edit-seeing A Ws post above, I had the same issue on trailer light connectors, attracting dirt. Found some cool "plug cover thingys" that you "plug into" when the trailer is sitting. This cured the dirt.
Hope this helps.