My daughter just moved into a condo with wooden stair treads to the upstairs...she has already taken a tumble (no harm done) when walking in socks, and her dog has difficulty navigating the stairs without sliding. I'd like to treat the stairs with some coating which won't be ugly or harmful to the oak. I thought about the "sandpaper" tread strips, but she wants to be able to walk barefoot without feeling like she is on an asphalt road. I know there are fabric treads which are available, but I was hoping for a paint or spray which might be less intrusive. Lots of products on the web, but was hoping for some local first-hand experience. Any suggestions?