DR's Extra Stringlife is a fluid-based polymer coating which acts as a blanket for your strings, acting against the elements, to promote your string's 'life' so to speak.
It's not cheap, $16 per bottle (the size of an average string cleaning fluid) but it lasted me more than half a year.
Does it work? Yes, it helps prolong that fresh, out-of-the-pack feel provided you wipe your strings down after each play.
Do strings rust? The coating itself has its useful life, once it wears out, strings deteriorate like they always do.
So why buy it? If you wish for your strings to last a little longer, more importantly, if you want that freshness to last a little longer, it's quite worth the asking price. Which would you endure:
- $16 for a bottle of string protection fluid (which you can re-use),
- or $18 for a fresh set of coated strings each time?
