All my salt water boats (Sail) had teak handrails and flat coamings under the winches....as well as a teak rail across the coach roof to attach the dodger with snap conectors. I liked the weathered look.
Weathered Gray. I tried the
"Treatments" a couple of times.
The
"Cleaners" are an Acid..and erode the "Soft" wood fibers of the teak. You end up with a very rough surface......kinda like when you pressure wash your deck. The Soft fibers get washed away....leaving the hard fibers standing up in ridges.
If you enjoy the Work.. FIRST: Light sand the teak with 180 grit sandpaper.... Then Rub the teak with
Bronze Wool to smooth the wood. The bronze wool will make the teak GLOW....you may decide the oil isn't needed.
NB
EDIT: Varnish HAS been used on teak by boat builders. (The Professionals) I wouldn't recommend it for amateurs. Varnish adhesion isn't great on teak because of the natural oils in the teak. Oils repell the varnish.