What is a Sealer?

A sealer, in the context of woodworking and finishing, refers to a protective coating or product that is applied to wood surfaces to seal and protect them from various factors such as moisture, stains, and damage. Sealers are typically transparent or semi-transparent and are applied before the application of a topcoat or finish.

The primary function of a sealer is to create a barrier on the wood surface, preventing the penetration of moisture, oils, and other substances that can potentially damage or discolor the wood. By sealing the wood, a sealer helps to reduce the risk of warping, swelling, and decay caused by moisture absorption. It also minimizes the potential for stains from spills or contaminants that could be absorbed into the wood fibers.

Sealers can come in different forms, including liquid sealers, sprays, or even certain types of wood stains that have sealing properties. They are typically applied using a brush, roller, or spray gun, and are allowed to penetrate into the wood fibers or form a protective film on the surface, depending on the type of sealer.