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If you over polish the pistons you can get to stage where they will suck in air but not leak fluid - but you have to be pretty unlucky to get there!
How much cleaning did you do?
If you live in a moist damp environment like mine the corrosion is usually too much to warrant even the thought of a reseal kit.
The pistons should be able to move freely. They should be able to do this for a long period of time - if they seize up in the next few days you didn't clean enough...
...it is a fine balancing act that is generally governed by the degree of corrosion.
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