The best and longest-lasting varnish I have ever used on my boats is ACE
brand Marine Spar Varnish. Holds up to Michigan outdoor use, daily dew,
long sun exposures, frequent rain, snow, frost, icing,. We walk and
climb and toss stuff all over this boat and use very little caution.
Weathers for several seasons and looks very nice, rich golden color on
mahogany. Second choice is Kush brand.