car wax

95% of car wax never stays on a car. Most car wax ends up on rags and in the trash. Only a tiny amount ends up protecting the paint. 

But! If you don't care what your car looks like, here is a way to get 50 to 80% to stay on the car when applied. Buy liquid car wax and put it in a cheap garden sprayer. Make sure the car is dry and clean. Then, with the car in the sun and some wind, spray the wax all over the car. Very little should run off because the sun will warm the car and the wind will dry the wax. You're done!

To really see how effective this is use graphene wax, as is has a gray color. Graphene is a good wax, but this process will look very ugly. Also it appears to be hard to get off, so be aware.