How can I repair the finish on a bicast leather dining chair?

We have a set of eight dining chairs which we bought thinking they were covered in leather. Turns out to be "bicast" leather which is apparently made out of chopped up leather waste. One chair was faulty from the start with the finish delaminating and now they are all beginning to go. I don't expect to be able to make them like new but if I could get them acceptable it would pacify my wife. Unfortunately I bought them on the internet and the retailer has vanished.