Applying a Sealer before a varnish is necessary to provide protection to the wood. The sealer creates a protective barrier that prevents the varnish from seeping into the wood pores. Additionally, a high-quality sealer can prevent the lifting of wood fibers and offers various color options to match or contrast with the wood tone. It can also be utilized to even out the color of an aged floor that has become yellowed over time. Alternatively, a Natural or Nordic-type sealer can be used to maintain the natural whiteness of a sugar maple floor. Moreover, sealers are generally more affordable than finishing varnishes and provide excellent coverage for maximum wood protection.