Well I ran out of my normal black to paint for my headlight relays and blower relays. So I had a can of STEEL-IT black spray paint I was testing if it was solvent resistant (It wasn't). So I used it for my black relays and I must say this paint is amazing. It covers with one coat. Sprays a very thick coat. When wet it has a little grayish shade but when dry is truly is a flat black. I suspect it will use much less than the other blacks but is it worth the $30 price? Not sure but so far, all my black painting will be using this product.
Also it drys very fast. No tack after overnight. Wish they had other colors.