...and I still love this product. Its great for all kinds of strings, especially on bass where I use it all the time. I put it on new strings, the first thing I do. It will keep them protected way better than if I didn't. Dirt, sweat and grease is the enemy of your strings. This product seems to be some kind of mineral oil (I might be wrong) and logic says it should dampen the tone in the strings. But it doesn't. Well, on new strings it takes of the "over-the-top-brightness" and makes the sound and feel like you played the strings an hour to make them sit better. After that Fast Fret just makes them last longer in tone.
Also it lubricates the strings and dampens noise from moving the hand over the strings. You can adjust the amount of lubrication you want to feel, by wiping off more or less after using Fast Fret.
How to use: Just swipe over the strings after putting new strings on. Wipe off the excess with the included piece of cloth. Also do this after EVERY time you play on your bass (or whatever) and you will keep the strings fresh.