Well, I esentially took all the advice offered, and went back over the boat with more mineral spirits, then sanded some more, then buffed it with a Scotch Brite and alchohol. Then I applied the most meticulous coat of epoxy I have yet applied, and she is beautiful today.
After applying the first coat of varnish, I got a rash on my wrist under my watch band. After stripping the varnish with mineral spirits, I got a rash along the inside of my thumb. Putting two and two together, I of course got three: I'm reacting to mineral spirits, or; something else in the varnish, or; something to do with the reaction between latex gloves (which aren't impermeable to mineral spirits) and the solvent. Fortunately, some of the advice I have heeded along the way pertains to the use of chemical respirators, which I wear without fail, and my reaction was merely a minor irritation.
Anyway, that's why I decided to put a coat of epoxy on instead of the urethane varnish. I am in a rush, as I am taking some friends down the Wild and Scenic Missouri River and we leave tomorrow. Upon return, I will probably try some of the water based Varathane varnish and see how me and the boat like it. I'll maybe post a pic later today, I did some veneer work on the deck from front to back, and she is pretty to my eye, at least.
A million thanks to all, more to come as I finish my Coho, which features a much more exotic veneer theme.
Thanks,
Bob