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Protecting an exterior slab on metal deck

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A local homeowner's front porch is a 2 1/2" concrete
slab on 1 1/2" metal deck over a full depth basement.
Moisture is penetrating through the concrete and has
started to rust the metal deck below.  Is there a
particular type of concrete sealer to recommend that
will adequately mitigate this problem?  They also need
a joint sealant to protect cracks up to 1/16" wide. 
There is no indication of spalling or other visible
concrete failure at this time.

Thanks for any suggestions,
Jim Wilson

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