I'm with Al on this one
Mike Schwing from Md.
>In fact, I was sealing a roughed blank yesterday and had the exact same conversation with myself. It was a big black cherry blank, probably 60% dry, and it probably wouldn't have cracked. BUT cherry moves a lot and I looked at the bowl as I was painting the endgrain and said "really, bowls are ALL endgrain", so I painted the whole thing. The only two exceptions, for me, are silver maple and ash, because I've discovered that they don't even crack if I leave them totally exposed. All of my work dries in a basement with year round 50% RH levels at about 70F.
If you seal the whole blank you'll have a much better chance of survival. It might take a while longer, but whats the rush?