I don't know if anyone with open reel decks uses LAST tape head preservative but I do with my Nakamichi, before playing each cassette. I send my deck for service every three years or so, and despite having thousands of hours on it, the technician says that the head wear is negligible. This is of course not a substitute for head cleaning, though it cleans too. It also sounds a touch better. When recording I sure treat erase and record heads too with the LAST. It only takes a few seconds to apply, no hassle at all, great stuff. There is in addition LAST tape preservative, but I can't apply it with cassettes, with reels you can. Walter Davies of LAST, nice man by the way, said that he had used his own preservatives for all his reels and decks for many years.