If you've read any of the many jobs I've done this summer, all of them were done with OG, and all were topped with either Permanon or FK425 or DG AW. You should wait a minimum of 12 hours before doing so. Chris is now saying that after fully cured (30 days?) that you can actually polish with an AIO (I would do DG 501) to add slickness. I've never tried this. Sounds interesting.
Hi richy, when you apply Permanon 12 hours later (or the next day), any additional surface prep required? e.g. rinse the car again or wipe it down again? As my car is parked outside under cover (but not fully enclosed garage) I suppose there might be some dust over 12 hours.