teak

[Rahn]

I use the natural and I haven't tried any of the other shades, though I know some people like the gold tone. The previous owner destroyed the teak using a pressure washer and literally slapped on a coat of Cetol which, of course, is all over the fiberglass. Initially, I sanded all the teak and used Semco's two part cleaner and now put on a coat or two in the spring using a foam brush. Any that drips onto the the fiberglass is cleaned up with a rag.

[hockeyfool]

I had to scrape off a traditional varnish off all my teak  on my 3rd boat, an unbelievably demanding job of special reaching scrapers/tools, time, and manual dexterity.  I have seen neglected Sikkens Cetol , that NEVER required such
  removal . Also when applied as directed, a minimum about 3 coats on rails, and about 6 on high traffic, foot trodden surfaces. Also they recommend a paired product for applying as a hard or high glossed surface. Look up the reviews and
  long term test results in Practical Sailor, you will see how Cetol performs when applied correctly.
    Once you clean and remove all mildew, mold, old varnish - it will be like glue, and also fills badly sun etched groves in old teak.
       Just my 2 cents.