Here is a email from my Shimano Guy.........today
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John....
Will the Core 50mg rust or corrode fishing saltwater? Please give me the truth on the reels and from what you know.
Jeremy Waltrip
Intertek - KCS / Apache Area 7
Measurement Technician
Office: 337-774-5992
Fax: 337-774-5994
Cell: 337-789-9002
Email: jeremy.waltrip@intertek.com
Jeremy
The Core 50mg is made with magnesium and this is what guys think is a saltwater no. I have been with Shimano for 20 years and I can tell you, that the Core model is built right for saltwater. Shimano is made with the best the market has to offer and if you ever have any corrosion from saltwater you just send me that reel back. I deal with a few captains out of Texas who stay ninety percent of their fishing time in the water! Core 100 is my best selling reel to this area of guys. I still believe the Curado model is by far the toughest out of all the Shimano reels just because of fewer problems due to the high number of reels in public. I put my word on the core 50mg along with some of the other reels! Jeremy If I did not think for one second the Core would not hold up in saltwater, I never would have introduced you to the reel
Thanks
Best Regards