Possible Results:
estabas impermeabilizando
-you were waterproofing
Imperfect progressive conjugation of impermeabilizar.
estabas impermeabilizando
-you were waterproofing
Imperfect progressive vos conjugation of impermeabilizar.

impermeabilizar

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