The CHB 34 accross the dock from mine uses Semco on all his external teak. He claims it is very easy to maintain. I don't like the look of it: Semco makes teak look like raw lumber, and not like varnish at all. It also seems to make the grain and natural imperfections more difficult to see, which results in a look simliar to tan paint (IMO). You might want to see what it looks like before you apply it.