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Answer for the clue "Makes airtight ", 6 letters:
caulks

Alternative clues for the word caulks

Word definitions for caulks in dictionaries

Wiktionary Word definitions in Wiktionary
vb. (en-third-person singular of: caulk)

Usage examples of caulks.

My blood caulks with fear, and furious thoughts of escape cross my brain like clawtracks.