A sealer is a substance or material utilized to close or block the openings, gaps, or pores in an object or surface, making it impermeable or resistant to the passage of certain elements, typically liquids or gases. Sealing often aims to protect the object or surface from potential damage, deterioration, or contamination by preventing the entry or escape of substances.
In construction or woodworking, a sealer refers to a type of finishing product or coating used to enhance the durability, lifespan, and appearance of various materials like wood or concrete. It is applied to the surface to create a protective layer that acts as a barrier, preventing water, chemicals, dirt, or other external factors from penetrating and causing harm or decay. By sealing these porous materials, sealer increases their resistance to staining, moisture absorption, decay, and damage caused by UV radiation.
Sealers can also be found in the automotive industry, where they are used to ensure airtightness and water resistance. For example, in car manufacturing, seam sealers are applied to joints throughout the body to prevent water leakage and reduce noise, vibration, and harshness (NVH).
Furthermore, a sealer could also refer to a person or machine responsible for sealing, such as a bag sealer, which is a device used to seal plastic bags or other types of packaging for storage or transportation purposes. This device utilizes heat, pressure, or adhesive methods to create a secure, airtight closure.
