Rusting keels and encapsulating.

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17aw54
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Rusting keels and encapsulating.

Post by 17aw54 » Thu Feb 01, 2018 2:30 pm

Does anyone have experience of keel rust? My Merlin 28 keels seem to weep rusty spots through the antifoul. I was wondering if treating with Rust Converter, Vactan or Original Neutrarust 661, or a similar treatment, then encapsulating them with epoxy or gelcoat prior to antifouling. We are considering CopperCoat, but understand that this can't be applied to the cast iron keels. I ask the question. Would CopperCoat be okay applied to encapsulated cast iron keels, and what would be acceptable, epoxy or gelcoat?

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philipstevens
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Re: Rusting keels and encapsulating.

Post by philipstevens » Thu Feb 01, 2018 5:46 pm

I have treated the keels of two boats - a Konsort and a Konsort Duo - with both Vactan and Neutrarust. Neutrarust is a better treatment, as it leaves a thicker treated layer to apply primer and anti-foul.

I used Neutrarust on the Konsort with better results than the Vactan on the Duo.

For both boats, I had the keels slurry blasted back to clean metal. I then left the keels to develop some surface rust before applying the treatments.

With Neutrarust and Vactan, I applied two coatings to go dry and black, before applying the primer. I applied the anti-foul before the primer went completely hard.

I do some electrical work on the Scillonian III, and Vactan keeps the rust at bay!! Not bad for a 40 year old vessel.
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Re: Rusting keels and encapsulating.

Post by 17aw54 » Thu Feb 01, 2018 7:51 pm

Thank you, Phil, for that helpful post. Do you think an epoxy primer such as JOTUN epoxy primer would be okay, what did you use?

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Re: Rusting keels and encapsulating.

Post by Jolly Roger » Thu Feb 01, 2018 9:01 pm

My Fulmar keel had some rust when I bought her. I stripped it back to bare metal and used 2 coats of Fertan, 5 coats of International Primocon, 2 coats of hard anti fouling, 2 coats of self polishing anti fouling. There have been a few spots that needed remedial treatment, but were minimal.
Roger
Concerto Fulmar FR38
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Re: Rusting keels and encapsulating.

Post by philipstevens » Thu Feb 01, 2018 11:14 pm

17aw54 wrote:
Thu Feb 01, 2018 7:51 pm
Thank you, Phil, for that helpful post. Do you think an epoxy primer such as JOTUN epoxy primer would be okay, what did you use?
I just used anti foul primer. Two coats to smooth the surface and then anti foul. Lasted for years with just a few touch ups.
regards,
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Re: Rusting keels and encapsulating.

Post by DerekH » Fri Feb 02, 2018 10:32 pm

Roger's process seems excessive to me - I have managed my previous Sadler and now my Fulmar with just a quick wet&dry to remove any build up of rust, 1 coat of Fertan, leave for any length of time(!), 2 coats of Primocon and then 2 coats of antifoul - usually lasts several years but does return eventually and some new spots need attention each year but with this regime its not a real chore!
Derek
Thalmia, Fulmar FR25 - The Exe

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