I'm trying pure tung oil for the first time just because I've never used it before. Project is a combinaton of maple and mahogany. How long does this stuff take to dry/cure? I applied as per directions and have waited 48 plus hours. The finish does not feel gummy, but when I touch it, I can see oil on my finger. This is my 3rd application. The first 2 I just waited 24 hours, and wiped it down before I applied more. The mahogany seems to be greasier. Also, for storage purposes, I understand I can just add water to the can and keep it topped up. Oil will stay on top?