"Caulking" is a form of "caulk", a transitive verb which is often translated as "calafatear". Learn more about "caulk" below.
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A transitive verb is a verb that requires a direct object (e.g. I bought a book.).
I caulked the joints to prevent dust and moisture from getting in.Calafateé las juntas para evitar que entrara el polvo y la humedad.