Hello; An additional use for the list is to help start small engines. If my lawn mowers or two stroke outboards do not stat a spray of WD-40 into the intake will often get them going.
I found WD-40 in a gallon can at a local stores (Tractor Supply,Lowes, Home Depot). I get small spray bottles to keep it in for various uses. This is a less expensive way to use it and the spray bottles can be refilled.
A friend also used it to spray his various guns from time to time. I have done this also but wipe the parts down after and use a specified gun lubricant and protectant such as Hoppes Gunmetal Polish or similar metal polish such as weanol.