I would second Charlie's warning.  In NC if you 'spray for pay' you need a
commercial pesticide license.  Since you want to apply a chemical to a
structure you would also need a structural pest control license.
Experience has shown that most violations are reported by neighbors or
competitors, and a homeowner with Bee Go in the wall might not be too happy
if the smell permeated the wall.

Bill Lord
Louisburg, NC

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