I normally ride in a fresh water lake but will be going somewhere that has salt water pretty soon. Will this completely destroy my bindings?

no, rinse them in fresh when the day is done. i ride in salt water as well

i ride in saltwater daily, after each use i take my bindings off hit them with saltaway and fresh water rinse. have fun!!

I ride in salt water as well... just rinse them with fresh water and theyll be ok