noun. ['ˈsiːlənt'] a kind of sealing material that is used to form a hard coating on a porous surface (as a coat of paint or varnish used to size a surface).
1. Noun, singular or mass Apply one even coating of the sealant to waterproof the deck and hold in the stain. 2. Adjective It needs to be dry for any sealant to stick and repair.
