Stabilized wood is the way to go for a grip/ reel seat application. It wont split, crack, warp and its saltwater resistant. It polishes to a high finish without the need for a "top coat" of sealer.
These blocks in the photo are some cross cut birch burl. For those of you who don't turn your own I can supply you with a custom grip or seat made to your specifications
If you have any questions or would like to obtain some of this wood contact me scott@solwaycustomcomponents.com