You use disposable rubber gloves, eye goggles, and a disposable popsicle stick to apply it. (The eye goggles are not really necessary, unless somebody comes along and throws some into your face, but what the heck, better safe etc. etc. etc.)
I’ve been using it for years with never an issue, although I do remember treating it like it was radioactive the first time I did. (Chuckle!)
It’s like a thick-ish gritty almost-paste, not a really liquid cream…it doesn’t have a lot of splash potential. And the lid on that bottle is a child proof safety cap, which means adults have a hell of a time getting into it.
You stir it a bit, (if you can), then apply it evenly 1/2 inch thick over the exposed areas that you want to etch, wait five minutes, and rinse it off with water. (I usually rinse it off in the slop sink outside, but you probably don’t even need to do that.)
The secret to getting a good uniform etch is applying an evenly thick layer on all areas - most people try to be too delicate with it at first, and that does not yield good results. You want complete half inch thick coverage.
They sell smaller bottles at hobby stores, and you don’t need much unless you are doing it for business. (I had a two ounce bottle that lasted for years, so if you want to just test it, get a smaller bottle.)
It’s fun, and it’s something you can experiment with while we’re waiting. (Heck of a lot cheaper than a sandblast setup, if you just need to do a few items.)