My experience is quite different than Dave's. Fresh cut grape vine is wet, I mean really wet with water running out. I dried some and it was gritty with sugar crystals. The 'wood' was so fibrous that turning was difficult and the result not attractive at all. I discarded and never made a completed project from it. My thought had been bottle stoppers. Maybe, dried, soaked in DNA and/or boiled would help before stabilizing. Downside, it really isn't attractive enough to motivate me to go through all that work. Besides, finding vine large enough to make into objects is difficult. It is a valuable food resource for animals and is already being decimated by so-called 'nature lovers' illegally harvesting it to make 'natural' and 'organic' crafts projects. What I experimented with had been torn up by bulldozers for a construction project. I didn't, and won't, cut any living vine in the woods.