I too am a long time LAST user (since the early eighties) and my records are still mint condition after all these years. I had the same question, along with "how long does the treatment last, once applied?". I called the factory and had a very educating conversation with them.
I was told that the formulation has not changed at all since its introduction, so that should answer your question. I was also informed that the liquid does not put a coating on the record, instead it permanently alters the chemical composition of the vinyl surface and the record will never need to be retreated. It cannot be washed or worn off.
I would suggest that you call the factory (see link below) and talk to them, as I did a few years ago - very enlightening. Keep using LAST and keep that analog flame burning!
http://www.lastfactory.com/help.html
I was told that the formulation has not changed at all since its introduction, so that should answer your question. I was also informed that the liquid does not put a coating on the record, instead it permanently alters the chemical composition of the vinyl surface and the record will never need to be retreated. It cannot be washed or worn off.
I would suggest that you call the factory (see link below) and talk to them, as I did a few years ago - very enlightening. Keep using LAST and keep that analog flame burning!
http://www.lastfactory.com/help.html