I manage a cat in Palma that has recently been coppercoated. About six months later we noticed that we had a leaking elbow
, looking further we think that most of the elbows above thru-hulls are becoming fragile. Diving
over the side we can see a light circular area around each skin fitting.
We think that the zinc used to strengthen the bronze
is being drawn out of the elbows by the copper. Is this possible? Coppercoat had no explaination for this.
We came across some historical documents showing how once timber ships had been sheeved in copper, the galvanising disappeared from the nails leading them to rot
in addition, we can get a continuity reading between 2 thru hulls, even though Coppercoat quoting the rather weak Branleys law say this is impossible.
Anybody shed any light on this for me?