The grey MF applicator is the way to go, if you're applying by hand. I like the rectangular shape. The corners help you get into odd spaces easily. Keep in mind a little goes a long way, so you'll be able to cover more area than you think. A thorough shake of the bottle, a liberal squeeze on the applicator (spread out to the edges) and you'll be able to do the entire hood, roof, or door panel and fender before reloading.