problem with aerosol cans is that they loose pressure pretty quick while spraying a larger area.. front bumper is considered a pretty large area to paint evenly with a rattle can.
if you have access to a roll to do the hood, dat should go much easier than getting those pre-cut kits. pre-cuts tend to be cut short for some reason and they tell you to stretch the bra while you apply. and if u're not careful it tends to leave stretch marks..
if you do it by the roll, no need to stretch and get full coverage...