I read the reviews about crackle before trying it (was going to buy & try myself not matter what :)), and saw noted you apply 1 coat before your top coat. Directions, on bottle confirmed and I felt pretty confident about the process and just went with it. I struggled a bit to not put too much or too little but after a little bit of time (and I highly recommend applying a shiny top coat), and in the ray of morning I think they look HOT! The few nails I thought may look funny around the edges, look fine :) I applied the black crackle over OPI's Tickle My France-y, but next time trying over mint green :D