I'm building a trash can trauma prop and want to weather the 31 gallon galvanized steel trash can, add some rust. I read somewhere that there is a youtube video on how to do this using muriatic acid. I can't seem to find that exact video.
Anybody have tips on precisely what I need to do? (Do I use spray bottle or sponge? Do I need to dilute it? Do I let it sit there or eventually wipe off?)