I believe the name of the expanding foam sealer is "Great Stuff" I've
used it for years and have had great luck with it. One thing I do is
to make a dam out of cardboard, I'll cut it to fit around a pipe that
comes out a block wall so there's no big blob on the outside with the
foam expanding inside the wall. "Good Stuff" is a song by The B-52's.
Great Stuff comes in two versions; one expands more, and the other
expands less. Both of them are hard to clean up.
DAP has a similar product that's water-based. I used it for the first
time a week or two ago, and it cleaned up with a damp rag, even from
brick. Downside: It took a long time to cure, and it cost twice as much
as the Great Stuff.
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