"DSK" wrote in message

katysails wrote:
We tarp and humidity gets under there...

Humidity is bad, especially going through thaw/freeze cycles, but unless
there are already bubbles in the varnish, or moisture sealed in, I don't
understand how this is going to tear up the finish. I have some experience
with boats left outside through New England winters, and they usually
required touching up... sometimes major touching up... but varnish up
there lasts a lot longer than down here in my admittedly limited
experience.

I agree with you last sentence, but I think the oil in teak is the culprit
in many cases. Some "experts" claim that *drying* teak with acetone or
benzene (not) prior to varnishing is necessary to keep the oil from leaching
to the surface under the finish. A friend's Panda 34 lost its varnished
finish, despite the owners' attempt to maintain it constantly. I examined a
piece of varnish that snapped off the wood and found it to be oily on the
underside.

Max