Tim, They are aluminum which is what causes the problem .Galvanic corrosion. Use Tefgel when you re-install. If you are working at the rear you may very well want to build up that spot as a couple of boats had catastrophic hull failure due to the thickness of the laminate under the rear beam.If you are replacing the plates I'd replace it with stainless.
"I said, now, I said ,pay attention boy!"
The cure for anything is salt water - sweat, tears, or the sea
Isak Dinesen
If a man is to be obsessed by something.... I suppose a boat is as good as anything... perhaps a bit better than most.
E. B. White
| 
