I contacted a boat builder and they recommended a penetrating epoxy. Runs like water soaks in well. Especially the ends...
Seals the wood fibers and is flexible. Worked out well. It requires a topcoat for UV protection.

Clear Penetrating Epoxy - Epoxy Sealer For Wood - JamestownDistributors.com.

Mike

Last edited by tclederman; 12/29/2020 7:11 PM. Reason: moderator changed "us" to "UV" if this is incorrect PM moderator
1940 Chevy 1/2 Ton presently... Almost done
1940 Chevy Business Coupe... In pieces