How about fitting a piece of glass on top of them that should protect them..But as far as waxing or something try Howards Feed & Wax.. If you have something that needs a bit more restoration Howards Restore-A-Finish.. Howards IMO is the best stuff out there for finishing.
http://www.howardproducts.com/prod-feed-n-wax.php
http://www.howardproducts.com/prod-restor-a-finish.php
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