OK, thanks guys. Ed, that's exactly what I'm finding. The leg tendons stripped out kind of fluffy and downy, and they soak up the glue really fast, maybe 10-20 seconds and they're good to go. The back tendons came off in little wires, and they need some soaking, maybe a minute or so, before they'll do what I want.
I did size the bow several times. Seven, I think? It never did become glossy, but it does feel different from the bare wood. Going to start laying some sinew tomorrow. Wish me luck! This is going to be a really cool bow. Unless it explodes. Then hopefully it'll be a really cool explosion.