Originally Posted by tegdesign
My surveyor didn't seem to think it was unusual for (probably 1987 original) props to need replacing due to galvanic action. But what trade would I need to engage to have my bonding system tested? I'm sure that's a good idea.
Rubbish. Lots of boats have props 30 yrs plus including mine and if the zincing is kept up properly those props should last a lot longer yet.
Yours are pinking because there is a problem. Zincs inadequate, not replaced in a timely fashion or an electrical leak.
If dealt with NOW and if they have just started any further damage can be stopped and the props could be good for many years yet. It will take a GOOD prop shop to figure it out.
A marine electrician with bonding experience should be able to help. The problem could be quite simple such as lack of zincs or not so simple such as leakage but get on it or you may force yourself to need new props and they will cost you big.
As far as that goes get a diver NOW to see if there are any zincs on the prop shafts. He can install new ones. If no zincs that could be the simple answer about why. He should be able to pull the props so they can be sent to the shop for an assessment. But even if there were no zincs get those props assessed. DO not ignore assessment because if they are too far gone and a blade breaks from weakening then it could cause hull damage if you are really lucky [not].
I see you also have bottom work listed. Do that and get the props done at the same time and save the diver.
Get the necessary stuff done now and wait for the toys. The rest are toys, IMO