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Treating corrosion pitting in aluminium boats

6 years ago
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keensailor
keensailor
NSW
702 posts
keensailor keensailor
NSW, 702 posts
27 Mar 2020 5:09pm
what is best way to treat and seal the inside of hull where pitting has occurred due to corrosion. Some of the pits have gone right through hull so I will be getting those spot welded. But I would like to treat the other pitting and slow further corrosion down.


stray
stray
SA
325 posts
stray stray
SA, 325 posts
27 Mar 2020 4:47pm
If its an old dinghy its probably not worth fixing.
would need abrasive blast and epoxy etch prime and top coat.
maybe a good clean and fish oil would keep it going for a while.
Ramona
Ramona
NSW
7758 posts
Ramona Ramona
NSW, 7758 posts
27 Mar 2020 5:53pm
Looks like an old rivetted alloy dinghy probably 60 years old. Don't weld it. I would suggest scrubbing the pitted area with a SS wire brush. Fill the depressions with epoxy and micro balloons and when it goes off, whisking a minigrinder and a sanding disc over it to flatten it off. Any holes glue on a patch with JB weld. Get the alloy really clean first.
keensailor
keensailor
NSW
702 posts
keensailor keensailor
NSW, 702 posts
27 Mar 2020 9:05pm
It is a 20 year old 4.6 metre Brooker runabout and is really only pitted like this in a smallish area at rear of boat. This was hidden under the floor as I later discovered. The boat is in pretty good condition with the exception of the small area so I want to try and preserve the boat.
Harb
Harb
WA
226 posts
Harb Harb
WA, 226 posts
27 Mar 2020 11:52pm
I've been using Penetrol on similar pitting on a couple of booms and an old mast and it stopped further corrosion. A light coat of silver spray paint over the cured Penetrol helps with UV protection .
Ramona
Ramona
NSW
7758 posts
Ramona Ramona
NSW, 7758 posts
28 Mar 2020 8:49am
keensailor said..
It is a 20 year old 4.6 metre Brooker runabout and is really only pitted like this in a smallish area at rear of boat. This was hidden under the floor as I later discovered. The boat is in pretty good condition with the exception of the small area so I want to try and preserve the boat.


Would not weld it still.
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