Wow! Thanks for the support.
I used an orbital palm sander with 100 grit, then 150 grit.
Wiped it down with naptha and then applied spar varnish with a brush. sanding with medium steel wool between coats and wiping naptha then a tack cloth.
Final coat was a rattle can of gloss spar varnish.
This inspires me to do the same on the teak around the centerboard which also has a strips of brass.
This I only gave a good scuffing and two coats of satin spar varnish.
Maybe next year.