What is the best way to in a surgical setting under general anesthetic to moisten the teeth? Would we recommend the clinician dampen a 2x2 and swab the teeth before applying FluoriMax ?
Using a damp 2x2 is a good option and so would be a slight water syringe use (with suction). Just make sure the varnish is after any flaps are closed, and after restorations are placed.  It (any fluoride varnish) will interfere with both.