There are many reasons to put wax over any finish , protection from handling and fingerprints is one of the main reasons . It also conceals a less then perfect finish for a short time . The wax will fill in minor lines and scratches left by a mediocre sanding and polishing job , however wax is soft and will wear away quickly leaving the lines and scratches visible .
Paul is right about me saying that Renwax is nothing but an overpriced natural shoe polish . Kiwi (and other brands) natural shoe polish performs , looks and even smells the same as Renwax at a much cheaper price and is readily available at your local supermarket .