Phenomenal base coat for ridges. This is available at Sally Beauty Supply for about 5.99. It's a great base coat for those of us who have deep ridges on our nails and need something good to fill them.
It dries super fast and works better than most of the other more expensive ridge fillers I have tried. I used to file the ridges down but noticed my nails kept splitting and peeling on those particular nails. I did some research and found that filing them just makes the nail weak. So I looked into ridge fillers and this was the one I stuck with.