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When you say brick, I think of brick. I HOPE your wall isn't just brick.
I don't know why you want to seal the wall??! If water is draining between the block (the operative word is draining), then that's what you want. If the backside of the wall isn't properly graveled, then you could get hydrostatic pressures pushing the wall OUTWARDS (which is what you don't want.)
My best to ya and hope this helps.
Jay J -Moderator
PS: God Bless America!