FWIW, It doesn't ruin the feel. What it does is properly condition and replenish oils in the wood, and the wood literally "drinks it in" and won't absorb what it doesn't need. This stuff was originally made for woodwind instruments such as bassoon, oboe, etc...to keep the wooden instruments from cracking. YOu put it on, let it sit overnight and wipe off any excess that isn't absorbed by the wood. Done. And no residue. It works wonderfully on rosewood, pau ferro (and I imagine cocobolo as well) and others without finish on them. As a little side note of its effectiveness: There is a store where I used to live years ago in another city where they had just made a deal with G***** guitars and was proudly carrying them....this was just a month before a certain individual became their CEO (and is no longer there); anyway, due to the new burden on Mom & Pop stores, they had a fire sale and blew out every instrument by that company they could and walk away. I happened to be there at just the right time and went home with a wonderful TV yellow "Special" variant that played and sounded great but had the ugliest fretboard I'd ever seen....very dry and had this yellow/green streak running through it. So I took it home, removed the strings, and dabbed some FretDr on the wood and let it sit overnight. Next day, the pores & grain had tightened up and that ugly streak was GONE.Turned out to be a nice slice of wood. And it's WONDERFUL on Brazilian Rosewood, IMO.