High -quality shield and modular parquet are made of natural trees, and many manufacturers impregnate parquet strips with a protective composition. This composition protects against harmful effects, so the modular and shield parquet already has its own protection. It is just as perfectly succumbing to the parquet cycle, and after that you can apply any type of varnish to the surface of the parquet floor. But in this case, you can do with one layer of varnish, especially if you have chosen such a type of varnish coating as polyurethane varnish.