Wow! I've never achieved a ring of lipstick on my nuts but she has left an occasional "high tide" mark!Hi, I used the missus lipstick (no chance she’s reading this so I’m safe still) and covered the circle round the inset nut, then placed the spoiler in the van, the lipstick transferred to the van and marked where I needed to drill. Worked a treat and officially I have no idea who had been in the make up drawer