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It would be interesting to know how much percentage of acid the stuff you used was. Coca Cola has phosphoric acid in it as most colas do, but in a very low percentage. Just like onions have a bit of sulfuric acid in them to cause your eyes to burn, but I would not refill a lead acid battery with just onion juice! You can also extend the acid working time by applying a coat of phosphoric acid, and cover with paper towel. Then coat again the paper towel with acid and cover over with the plastic wrap. The towel will act like a sponge. Plus works well with any non-jellied acid to work on vertical or inverted surfaces.
Just to be clear, Ospho, Naval Jelly, and most other rust removers have same phosphoric acid in them as a primary rust remover. NJ just has a jelly added component which is great to have if you are attacking rust on a vertical or even inverted surface where an non-jelled acid would just flow off. We got our acid (75% strength) from a chemical supply shop in Seattle for a lot less than the brand name liquid acids at the hardware store. While using a phosphoric acid to remove rust takes more time than say to do sandblasting, the acid will remove only the rust and none of the steel.
A phosphoric acid rust remover chemical treatment is great, but you can get a coating of it to work better and longer by laying plastic food wrap over the acid on the item and leave over night. The plastic keeps the acid from drying out so it will work longer. The cooler the weather the better and longer it will work, have gotten it to stay wet and work for days in 50 F weather. During Summer hotter weather it will dry out a lot faster, but doing it over night helps to off set the heat of the day. As for WD-40 it is a good water displacer and OK rust penetrator, but because it does the latter it is way too thin of oil for long term rust protection. It will evaporate off all too soon. Have seen it fail over a weekend leaving rust on a milling machine in an air conditioned shop.
Adding 'Oomph' to the Garden Solar Light