If moisture should get past the outside window seal, it would wick into the foam and go who knows where.
I used polysulphide, carefully rubbed in with a finger. To protect my finger from rough edges of fiberglass and to keep it clean, I used fingers cut off of rubber gloves (the gloves went 10 times further this way).
Counting clean up, each window (there are 6) took me about an hour to do, and I used that whole tube of polysulphide.
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