In by Jackie Dunn

An elastomeric material with adhesive qualities that is applied between components of a similar or dissimilar nature to provide an effective barrier against the passage of snow, rainwater, wind, etc.

Merriam-Webster Online Dictionary
sealant (noun)
a agent - sealing a radiator sealant
a plastic material applied to parts of teeth with imperfections (as pits and fissures) to prevent dental decay
sealant (Wikipedia)
Self-leveling silicone firestop system used around pipe through-penetration in a two-hour fire-resistance rated concrete floor assembly.

Sealant is a substance used to block the passage of fluids through the surface or joints or openings in materials, a type of mechanical seal. In building construction sealant is sometimes synonymous with caulking and also serve the purposes of blocking dust, sound and heat transmission. Sealants may be weak or strong, flexible or rigid, permanent or temporary. Sealants are not adhesives but some have adhesive qualities and are called adhesive-sealants or structural sealants.

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