3 months ago i had a solarpanel mount made out of 316L in Guatemala.
After a few weeks i noticed the first traces, and now 3 months later, the whole thing is covered in rust. Not a thick layer, just a tiny layer that is easilly removed by hand with some 360 grain sandpaper.
Strange thing is, it is also happening to the stainless bolts and other mounting materials that i bought in different shops in guatemala so its not just the welder that screwed me with some lower grade stainless.
Is this normal for 316L? Is it guatemalan quality ? Or can it not be 316 at all ?
If this is normal, what are my lifeline stanches made of then ? They are ancient and have only a few spots on them. Other parts like winches, cleats and hatch hinches are similarly ancient and totally spotless.
Finally, what is the best i can do about it ? I am currently sanding it with 360grain, then 500 and finally i hand polish it with turtle wax. I have no acces to electric tools where i am right now and just materials from the mexican shopping centres.