before a rotary. The Harbor freight ones are shit lol. I believe Ultimate Polish can leave micro-marring that you won't see with those lights. You should also invest in a spotlight like a Brinkman. Micro-marring is a bitch. I don't know if it's easily visible with your color Z, but on my black Z it was horrible in the sun. Followed up with a finishing polish to get rid of it. But if you're fine with it, sealant/wax would cover it up decently.