Possible Results:
impermeabilizabas
-you were waterproofing
Imperfectconjugation ofimpermeabilizar.
impermeabilizabas
-you were waterproofing
Imperfectvosconjugation ofimpermeabilizar.

impermeabilizar

TRANSITIVE VERB
(to make impervious)-to waterproof
Synonyms for impermeabilizar
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