Do you mean I need to use some (spray foam insulation?) sealant that seals up the conduit/wire where it comes into the panel.
Yes, GFCI's are first in line on all of the plugs circuits.
300.7 Raceways Exposed to Different Temperatures.
(A) Sealing. Where portions of a raceway or sleeve are known to be subjected to different temperatures, and where condensation is known to be a problem, as in cold storage areas of buildings or where passing from the interior to the exterior of a building, the raceway or sleeve shall be filled with an approved material to prevent the circulation of warm air to a colder section of the raceway or sleeve.
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