The RKW finish is a highly linked polymer and I don't know of a commercially available source. I use a rubbing polyurethane available at the local WalMart and many other sources. It is very durable and looks the same as the Remington finish when properly applied. Both the RKW and all other poly finishes sit on the surface of the wood, penetrating very little. They can crack and when they do moisture will get under and lift them. This appears as yellowish clouding and there isn't a good fix, other than refinishing,. Sometimes a touchup will work but usually it will not match, standing out like a sore thumb.