Bassyaks uses freshwater Minn Kota motors and offers a saltwater "option":
Saltwater option
Interlux Primocon a non-bleeding, anti-corrosive primer is used to provide an excellent barrier on underwater aluminum surfaces . After which the housing is painted with Interlux Trilux 33 is specifically formulated for aluminum engines, and drive parts, The motor shaft is then sealed, and electrical connections are encapsulated in resin. Giving this motor a rating of IP68, capable of submersion
This procedure can be applied to any of the motors we use
Add $100.00
http://bassyaks.com/saltwater-option/
from BassPro Shops (about Minn Kota's saltwater Riptide motors) :
•Saltwater-engineered, premium-grade marine alloys--virtually impervious to rust
•Indestructible composite shaft--pound for pound, stronger than stainless steel
•Fully encapsulated electronics--control boards are fully encapsulated in marine-grade urethane
•Sacrificial anode--patented, replaceable anode protects metallic components from galvanic corrosion
Minn Kota Riptide Transom-Mount Trolling Motors offer advanced corrosion protection. Premium-grade alloys are impervious to rust. Metals undergo a rigid multi-step cleaning process before being anodized or coated with special zinc dichromate armor plating. All components are then finished with a 5-mil TGIC polyester powder coat paint. All models except SC (5/3 speed) models feature Digital Maximizer™ Technology, which allows up to five times longer run time on a single charge. All Riptide trolling motors feature a sacrificial zinc anode to fight galvanic corrosion. The replaceable anode is conveniently mounted on the prop hub for better protection and longer motor life. All Riptide motors feature a manufacturer's 2-year limted warranty.
http://www.basspro.com/Minn-Kota-Riptid ... ct/103795/
For the sake of comparison...Bass Pro Shops pricing... MK Riptide (saltwater) 45 thrust lbs 5/3 speeds $250 variable speed $300. MK Endura C2 (freshwater) 45 lbs thrust 5/3 speeds $200. MK Endura Max (freshwater) 45 thrust lbs variable speed $240.
"the bottom line"...takes more than an anode and a garden hose to keep an electric trolling motor used in saltwater in good shape.
Whether you DIY (replace all nuts, bolts, etc. with stainless steel, seal the shaft, paint, anode, etc.) or pay someone else, i.e., Bassyaks, to do it (and do it right) with time/labor and materials you'll spend at least the same, if not more, than the difference in cost between fresh vs saltwater models.
And if you're buying a new electric trolling motor, putting a freshwater model into saltwater, good luck expecting any help from the manufacturer for corrosion-related problems under warranty.