sealant

Definitions of sealant
1

n 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)

Synonyms:
sealer
Types:
caulk, caulking
a waterproof filler and sealant that is used in building and repair to make watertight
Type of:
sealing material
any substance used to seal joints or fill cracks in a porous surface

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