On Cetol, I initially like the finish and really liked easy maintenance. But after 5 years of application to the letter of the instructions, the finished teak noticablely darkened, alot, and areas that needed repair
would not match at all. Then it all started peeling off -- as water got under scratches, etc.
In retrospect, I think putting the gloss finish on top of the light version would be a way to go to prevent buildup. Fortunately, I sold the boat, so that''s someone elses project. My new (to me) boat has varnish
on the teak, so I think I''ll go with that for the time being and see how it goes, and if technology ever triumphs over weather and sun, and wear and tear, then I''ll rethink it.