Most durable finish for dining table?

Okay, you finishing experts, what is the toughest, most durable finish for a dining table that can be applied at home (i.e., no spray booth).
Next on my "honey dew" list (Honey, do this; honey, do that), is a table with a baltic birch plywood top that will match other furniture in the same room. She wants a ring-resistant, watermark resistant finish. I had thought about conversion varnish but learned it's probably beyond my capabilities to apply. What about marine varnish? My gut tells me that the woodwork on boats has to stand up to heavy abuse, so why not? Is there a better option that I should know about?
TIA, Ian
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1) a piece of tempered glass, on top of the wood 2) a two-part, clear 'epoxy'. 3) there's a sealer/finish made specifically for bars -- cant think of the name, but somebody else'll chip in with it. 4) a good _gloss_ varnish. Apply many -thin- coats, vs. a smaller number of thin ones.
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If you have an area where you can spray and let it sit, you can apply pre and post catalyzed lacquer, conversion varnish, 2K polyurethane and polyester finishes. Sorry, polyester is out; requires special equipment. Conversion varnish may be out - it is hard to find in less than 5 gallon containers (2K poly may be the same). Personally, I would try 2K poly, followed by conversion varnish, followed by pre or post catalyzed lacquer. I spray a lot of ML Campbell pre catalyzed lacquer (Magna Max http://www.mlcampbell.com/pages/starpage.asp?star=MAM ) It is a good lacquer for a lot of situations. Obviously there is better, but I can buy it in gallons instead of 5 gallons. Also, it is nearly impervious to water and chemicals and passes the TR-6 specs for this.
For hardness, check out http://www.pencilpages.com/articles/simmons.htm
If you want the final word from the professionals and prima donnas, ask in this forum http://www.woodweb.com/cgi-bin/forums/finishing.pl
Hope this helps, Preston

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Preston,
what is a "2K" poly?
dave
Preston Andreas wrote:

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was that a good year for poly? :)
dave
solarman wrote:

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