It is. Unless you planning on using a lot of spalted woods or burls, those are better stabilized because they aren't a real stabile wood in the first place. If all your using is a good solid wood then a finish is all you need on them. Don't try and make up a bunch of soundboards all at once, make them as you need them, just keep your wood supply dry and you won't have problems with them. Stabilized wood means it's stabilized with resin and in doing so take a lot of the tone qualities out of the wood, makes it more like a glass soundboard. You can get a good sealant by putting a couple coats of tongue oil on them, tongue oil is what's used on wood duck calls to seal them, and they get plenty of water on them.