Finished all teak on boat, went with Cetol Natural and Man-O-WAR clear. Went to the local marine paint store and asked what they thought I should use. Owner said he has 6 different clears in stock, go out the back door and pick the one you want. Thinking where is this guy sending me, but he was following. In the back yard of his store in the weather was 3 6x6's all had different clears. They are all 2 years old and that is what they look like, you pick.
I used the same brush for the entire boat without cleaning it. Someone had posted a while back about putting your brush in a plastic bag then in the freezer until ready to use it again, IT WORKS.