Cetol or Armada
Oil-based products that dry to a hard finish and last a full season. The initial prep--cleaning, sanding as smooth as a baby's cheek--is as much work as prepping to varnish, but that's the only time you'll EVER have to do it, nor will you ever have to clean teak again. Unlike varnish, it doesn't crack or peel, and scuffs and scrapes can be easily touched up. Once a year--maybe twice in tropical climates--a light "sanding" with fine bronze wool to remove ground-in dirt and scratches...one new coat...you're done for another year--or at least 6 months. Search the archives...there's been a lot of discussion about teak care and these two products. Most people who don't like 'em either skimp on the prep, don't follow the directions, or let 'em go too long before applying another coat.