My nails are very smooth, but I use a ridge filler as my base coat. I recommend Essie's ridge filler. This is a great base coat. Use it alone and it gives a great buff look. Layer it underneath any polish and the polish goes on extremely smooth. If you have any imperfections this will fill in so your nail bed looks smooth. I have tried a few other ridge fillers and this is one product I believe that you should invest in if you paint your own nails. I usually will put on a ridge filler and let it dry completely then layer the color.