Probably too late, but here goes.
If galvinizing or any coating at all was not in your work agreement, how are you responsible?
Next, electrogalvinize is crap. It should have been sandblasted and hot dip galvinized. Again not your problem, but you can point a finger.
I would work with the customer, tell him that, and then ask for records of the finishing work. Probably the customer is just looking for options. And remind him that next time, you will be using stainless steel.
Did you do the final install? If so you might just be liable.
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Thread: Am I Liable
06-15-2013, 10:38 AM #11Nothing welded, Nothing gained
3 ea. Miller Dynasty350DX
ThermalArc 400 GTSW
MillerMatic200 with spoolgun
Linde UCC305 (sold 2011)
PlasmaCam CNC cutter
Fadal Toolroom CNC Mill
SiberHegner CNC Mill
2 ea. Bridgeport
LeBlond 15" Lathe
Haberle 18" Cold Saw
Doringer 14" Cold Saw
6 foot x 12 foot Mojave granite