Let my mistakes be your successes. 😅 The 1 hour express is AMAZING. Dries quickly (and really dries.. doesn’t leave you feeling tacky) and has an even darker color than the “ultra dark”. Ultra Dark, didn’t matter how long I waited, it never dried - washed off after 7 hours (2 hours past what was on the bottle) and I wasn’t much darker than I started. Don’t waste your time on that one