I have records that were treated with LAST close to 40 years ago and they sound fine. The original last treatment does a nice job of lowering surface noise. (Part of this might be connected to the high grade cleaner/applicator brushes included) I'm not sure what it is or why it works, but it does. (Their description of what it does has been debunked by chemists) If you decide to try it I strongly suggest buying directly from the factory. About 15 years ago there were some folks who apparently purchased a large number of bottles and saved the contents in another container. They then refilled the last bottles with something else and sold them on eBay.