I think the original "hammerite" was the better product they tried to copy. intended as machine paint, has fibers in it to make it tougher. it did have to be sprayed on pretty thick wet all at once for the beading reaction of black-silver-color and a clear to rise onto the top.
about 20 years ago built a tandem bicycle (easy welding project) painted it in green hammerite came out looking really nice. last tandem I built got rustoleum "hammered" coppery color, nowhere near as pleasing effect from the stuff.