If you want a sanding sealer that you can use on all kinds of projects, underneath any sort of finish like water or oil-based poly, lacquer etc., you want to find some wax-free shellac. You can buy it in flake form and mix your own with denatured alcohol - $10 worth of flakes is a lifetime supply - or there's a premixed product called "Bulls Eye SealCoat" from Zinnser that you can order through your hardware store. It's a good idea to make the acquaintance with the best hardware store in town anyway - it won't be a Best Buy or Ace, choose the one with the huge rack of tiny little screws and the biggest selection of long, tiny & odd-sized drill bits, you'll be glad you did. :icon_biggrin:
http://www.thewoodshop.20m.com/finishing.htm
http://www.sawmillcreek.org/showthread.php?t=39011
You just want to buy Michael Dresdner's book "The Wood Finishing Book" anyway, but here's a page on sealing from one of his other books:
http://books.google.com/books?id=m38A6OhyT0gC&pg=PA27&lpg=PA27&dq=%22wax+free%22+shellac&source=web&ots=mRl-Ftat2s&sig=MEAMqgthzpIep7EcI0JqzJ_DSrk
http://en.wikipedia.org/wiki/Shellac :hello2: