Cut the Pure Tung Oil with Citrus Solvent at a ratio of about 4:1. Rosewood is not very porous, and has its own oils, so you will need the tung oil to be thinned to really get any penetration, otherwise it will sit on top and take forever to soak in and dry. That's what I had to do on my rosewood neck. Rub it down well with cheesecloth, let it sit for about 15 minutes, then with a clean dry cloth, rub the excess off. Do this about 4 or 5 times, waiting a day or two in between coats (depending on the drying area you're doing this in). If you go with a ratio less then 4:1, you'll probably need some extra drying time (could be more then a week) between coats. There have been a few threads about this exact topic, just give it a search. And good luck, we want to see this when its done.