Nails will be punched and filled; end joins, knots and parquetry will also be filled. The gaps between boards are not normally filled, to allow for expansion and compression of the wood. If filled, this process would cause cracking.
After this, a coating is applied which will enhance the flooring in your home and protect it for many years to come given the correct maintenance.
Slight variations and imperfections can occur as no two natural timbers are alike. Therefore, achieving a ‘furniture finish’ is virtually impossible. However, these ‘imperfections’ simply add character to your floor.