I have used it personally I don't like it. We used it on places where we cut galvinzed I beams at work Very runny and I think it looks cheap when you paint something your going to look at alot. I would just use paint or possibly a wrinkle paint if it was me.
I used it on the galvanized pool walls when I put in a new liner this spring. Like others stated it is very messy and runs as it is a very heavy spray and the nozzle on the can is probably 3-4 times as large as a normal spray can.
I doubt you can get a "good" looking finish out of a rattle can of the stuff.
In my situation it is behind the liner and I didn't care what it looked like just that "hopefully" it will do it's job. I'll find out in 10-15 years I hope.