Snag, having moisture in the wood would help the hide glue sink in I believe. In the past I would allow a month between each sinew application(which also adds moisture to the wood) so that gives plenty of time for that moisture to evaporate. On this one I added two courses within a few days of each other but was going to let it dry for at least a month before stressing it.
Art, that might be the best option. I know the TBIII will stick to the sinew and the wood. On the original sinewing I used Knox for the first two layers of sinew but TBIII for the third and final layer then used TBIII for the snakeskin covering. Any particular varnish. We have satin spray poly here most of the time for Marcia's paper mache projects. Or should I use spar varnish?
Scott, I did use oil to straighten this bow but that was back in 2005 or 06. I had some sinew problems then also that I repaired with TBIII. I have used oil to straighten bow for years and on other sinew backed bows and I haven't had problems like this one or problems with tip overlays. I don't doubt that a veg oil could be absorbed into the cells. Never thought about that. I know it doesn't go very deep in the wood. I usually scrape it off while tillering. And, I don't add oil or heat to the back of the bow. I'm sure some gets on there anyway.