Near:
Drop an email to Viking Air or Kenn Borek Air and inquire on if they use a particular program for saltwater ops. I'm sure Viking has some sort of Corrosion Prevention Program that addresses your questions.
If not an option and at a minimum, after your saltwater flight douche the entire aircraft with fresh water to remove the salt residue. Washing with a aircraft soap would be better. Also add a corrosion preventative like Corrosion X to areas prone to holding water like float bays, and reapply on a regular basis.
W1