"It's an aerosol of paint that works when you point it down.
You squeeze the nozzle and paint comes out. Paint doesn't come out if you don't squeeze the nozzle. That's it. The paint I doesn't wash off in the rain. It's fine. You get a fair amount of paint in the can. I didn't need anything like that much so I thought it was a bit expensive and a waste of the excess paint, however if you need more than I did it becomes more economical."