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But my dictionary lists the perfective as "поболтать?"

разболтал will sound more natural
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What would difference in usage be then, for болтать and разболтать? I only know болтать from those "НЕ БОЛТАЙ!" posters...

Neither of these are literally translations -- but more variations on a theme:
-Он ничего не болтал никому. (with the connoation of he didn't tell/gossip/spill the beans...)
-Как вы думаете о...