Makita 98202 amp Horizontal Wheel Wet Blade Sharpener ...
The steel parts are plated to resist rust. The cast iron is not. Maintenance is required, including emptying the water from the machine and allowing it to dry. I use WD40 on the cast iron and on the steel too after a grinding session. If you don''t maintain the machine (that is, if you allow it to stay wet after use), of course it will rust ...