No matter what product you use (sealant, oil, varnish, wax, etc.), you can't prevent external aggression from damaging the floor's protective layer. Variations in temperature, washing down with water or cleaning with abrasive products can cause irreversible stains and scratches to appear on a wooden floor. When the finish is no longer shiny and there are a lot of unsightly marks that refuse to go away, parquet renovation is called for.
Renovating the floor means restoring all the aesthetic qualities of the wood protection by choosing a new finish if possible (matt, gloss, lacquer, satin, etc.). Renovation extends the life of the material by renewing its protection against humidity, water splashes, scratches and other external aggression. For example, sealing an old parquet floor makes it more resistant to frequent use and unsightly stains.