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Do the Anodes have to be bolted to the hull or can they by glued?

Posted: Wed May 16, 2018 10:04 am
by Red5
Does the sacrificial metal have to be bolted onto the hull? Or can I attach using some sort of adhesive?

I've been getting some pitting near my props and I was going to epoxy some strips near that area. Do they only work if grounded to the hull? Or do they function just be being there? :geek:

Re: Do the Anodes have to be bolted to the hull or can they by glued?

Posted: Wed May 16, 2018 10:20 am
by shade2u2
I believe that they need to have good surface contact with the hull - or shaft or tabs or rudder...

Re: Do the Anodes have to be bolted to the hull or can they by glued?

Posted: Wed May 16, 2018 11:29 am
by EWRice
Bolted, welded, or you could glue them only if you had a bonding wire connected from the anode to the hull/rudder/tab/etc. Bolting is easiest.

Re: Do the Anodes have to be bolted to the hull or can they by glued?

Posted: Wed May 16, 2018 11:40 am
by jralbert
Using adhesive to attach anodes prevents the two metals from making contact which is the opposite of what you must achieve. Very bad (and useless) idea -sorry to disappoint. Assuming your keel anodes are properly attached, what's the condition of the anodes on your trim tabs and rudders? Is the shaft properly isolated?

Re: Do the Anodes have to be bolted to the hull or can they by glued?

Posted: Wed May 16, 2018 11:53 am
by Red5
My anodes are getting eaten up and there was still some pitting. I do Not want to drill through the hull to mount additional stuff near the props so I guess I will just replace what I can where it was originally placed.

Re: Do the Anodes have to be bolted to the hull or can they by glued?

Posted: Wed May 16, 2018 12:39 pm
by shade2u2
Most are like these. I have not seen a Marinette with anodes on the hull other than the Keel.
I added small disks as an experiment to monitor protection...
I should probably add one to the rudder.

TRIM TAB
RUDDER & SHAFT
KEEL

Re: Do the Anodes have to be bolted to the hull or can they by glued?

Posted: Wed May 16, 2018 12:43 pm
by Busia
They are SACRAFICIAL anodes. They are meant to dissolve. Go to BoatZincs.com to find out what kind and how many you need. Or call them up, they are helpful. Buy your anodes here too, they have the best prices. Good luck with your boat--

Re: Do the Anodes have to be bolted to the hull or can they by glued?

Posted: Wed May 16, 2018 1:05 pm
by jralbert
Red5 wrote:My anodes are getting eaten up and there was still some pitting. I do Not want to drill through the hull to mount additional stuff near the props so I guess I will just replace what I can where it was originally placed.
In the 20+ yrs I've been following Marinette forum posts, no one has suggested or reported attempting to mount anodes by attaching them to the hull. Way, way too much risk of failure (although other items such as CAPAC, depth sounders do get attached to the hull because they are sealed with a marine caulk and anodes are not).

As noted above, and with photos, the points are keel, trim tabs, rudders, shaft (but really not needed if shaft is isolated).

Do you have CAPAC - what does the meter show?

Is it possible to include photos? Or better describe area that's pitted? Someone may have some helpful suggestion for you