What Does a Sealer Do on Wood?

Sealers. Deck or fence sealers are usually a clear/transparent finish that coats the outside surface of the wood. The primary function of a sealer is to repel moisture. It is very beneficial to have water-proof wood, as unwanted moisture can lead to fungal growth and wood rot.

When should I use wood sealer?

Sanding sealer should be used after the wood has been sanded down to a bare finish but before the topcoat (such as paint) has been applied. Applying sanding sealer to a stained surface is generally not recommended, as the sanding step will scuff away the stain.

Do you need sealer on wood?

Yes, sealing wood after staining it is essential to protect it from damage and discoloration from foods, liquids, human touch, and piercing objects. While wood stain may seal the pores and offer some protection from moisture and water damage, its primary purpose is to color natural wood.