i always have had a problem with mine dryin out really bad...like evry 2 trips 2 the lake ...so i had a woodworking buddy plane them down and hit um with teak oil...and i went with the spar varnish :screwy:but im no expert...
The problem with varnish on teak is the wood is really oily.....The varnish just sort of sits on the wood and does not really penetrate like it would on mahogany or ash. It also breaths so it like to expand at an unbelievable rate....Guess what happens when something expands and contracts when it is sealed up? I compare it to trying to paint over oil.
The varnish will simply peel like crazy once the water gets under it......

If you get the pores of the teak filled with teak oil (really like the Amazons) the finish will really hold up. We have had ours in the water for two weeks at Shasta, pull the boat out and hit them with the hose, let em dry and hit with a terry cloth and some Amazons and back to storage she goes...Sometimes I even put the oil in the microwave to heat it up a little, it makes it more thin and really gets down in there....

GT