Flooring Tile - Polyurethane Sealant Removal

I have saltillo clay tile that has been imported from Mexico. I have had this tile for nearly ten years, and in that time span, Have put on multiple layers of polyurethane sealant/lacquer. It is starting to flake off, and it makes the tile look horrible. I am trying to find a method to removing all of the layers of the sealant without spending too much. I have tried sanding it down with a large floor buffer (which didn't work :P) and the only other solution I can find is to buy a sealant remover. The problem is, the only one I can find is a small bottle that costs $20 and can only cover 50 square ft. My tile porch is roughly 300 square ft, and I do not want to spend much time or money on this, hopefully under 75 dollars and less than 6 hours of work. Do you guys have any suggestions? I'm at a real roadblock here :wall:

Thank you
-Steve

Try to get some of this, it's very good stuff!

http://www.aquamix.com/products/pg_detail.asp?pdid=2462&pgid=9833

The 1 Gallon version covers 75-200 sqft depending how many times you gotta use it. It's $53, but you can't expect a cheap product to work. This stuff will work.