Possible Results:
estuviste impermeabilizando
-you were waterproofing
Preterite progressiveconjugation ofimpermeabilizar.
estuviste impermeabilizando
-you were waterproofing
Preterite progressivevosconjugation ofimpermeabilizar.

impermeabilizar

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