Hi all,
a couple of years ago I repaired a bow tang on the port bow of my Nacra 5.2. It was loose and showing some cracking (probably from inwards directed load and years of neglect). I used epoxy and had the lids off so I could structurally re-seat the tang and rebuild the damaged layup. I know it is 100% sealed in and no water gets through there to the inside.

What puzzles me is that the repair side now has a clearly visible brown rust streak running down the hull while the unaltered side shows no staining at all.

Could there be a compatibility issue with the epoxy I used and the stainless tang? I can't think of anything else. The epoxy feels tough, it has hardened well and even supports a thick layer of (polyester!) gel-coat to this day.

Should I just clean it up periodically with some acid or is there a really good way to seal the rusty tang and keep it from rusting all over my boat?

Thanks in advance for any advice,
Dennis