Some friends left from the Chesapeake the same time we did, approx 2 years ago. In the tropics most of the time. I saw their teak after 2 years. Yuck! It didn't look like fresh teak. It didn't look "healthy", it looked like it had sat in the Sun and been dried out for 30 years. Oh! It was the same brown color the Cetol Natural is. But I would NEVER put that on my boat. Yuck!
Go Slow
Sail Far
Stay Long
ps this is a pic of our teak taken about a two months ago. Last varnish was 10 months prior. Age of all varnish is approx 4-5 years. Number of times varnishing per year - one, number of coats / year 2. Number of coats / day, 2.