I don't know why old doubles were not sealed inside, or were they ? Or some of them with something not now so apparent.
I have a book in front of me called The Shotgun Stock, design construction & embellishment. Author= Robert Arthur. Printed in 1971.
Page 153 Chapter 20, under the heading Gunstock Finishes, I read this.
"The next step is sealing, the sufficient application of some moisture resisting agent to all surfaces of the stock, both inside & out. The finish itself, as well as the sealer, should be as waterproof as possible."
O.M
