I think ,sikkens cetol HLS ,and then the filter 7 exellant alternative to varnish
.you will need to rub wood right down to bare then if teak
degreese, 2 coats of base then 1 of filter 7 then every 12-18 mths quick wash down with fresh water
and 1 coat on top very quick,if any areas have been worn through to bare wood easy to touch in with base coat first. Very important to use the lightest shade ie pine or light pine does not have the depth
but looks nearly as good,and wit out 7-9 coats of carefull application.They now do a novateck version which contain 75% solids so should last even longer.