Yes, Paul. Hickory especially needs wet heat for smooth bending and to hold the bend when dry and cooled. You can use shellac on the back to help prevent any checking that might occur. I keep spray shellac on my work bench all the time. Also, you can set the bend with dry heat after the wood has dried well.
Slight adjustments can be made with dry heat on hickory but for recurves and drastic bends, steam(or boiling) is your best bet.