I since discovered that the owner sanded and refinished only the parts of the floors showing signs of wear. Then, he applied a coat of poly to these areas, and a second coat over the whole floor. He used Minwax Helmsman Spar Varnish Clear with Satin finish. This is waterproof outdoor stuff intended for boats etc.
My questions are: * Is this product recommended or OK to use on oak parquet floors? * Will it allow the wood to breath. * Will his partial restoration cause headachs during a complete sand and restoration? * Is there anyone out there listening that can give any advice?