IPA: /ˈsiːlər/
KK: /ˈsiːlər/
A person or thing that seals something, often used to refer to a device or substance that closes or secures an object.
The sealer applied a protective coat to the wooden surface to prevent damage.
Sealer → It is formed from "seal" (from Old French *seel*, meaning a device for making an impression) and "-er" (meaning a person who). A sealer is a person who uses a seal, typically to authenticate or close something securely.
Think of a person who uses a 'seal' to secure or authenticate something — that's what a 'sealer' does.