cast iron keel coating - Page 2 - SailNet Community

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  #11  
Old 02-14-2001
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cast iron keel coating

My thanks to all the input. I have started grinding on the keel and it''s obvious that there will be small minute areas where I can''t get all the rust out thus requiring the etching for treating.I''m going to be working in small batches until I can get a good coating over everything.
Has anyone used Petit metal primer or petit rustlock steel primer?
I''m thinking that etching and then metal primer will allow me to get a coating on the new work as I progress and then epoxy over the primer on marm days.
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Old 02-14-2001
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cast iron keel coating

cont: Using metal primer will allow me to grind, etch and prime one area. While the primer is drying[2hrs], I can move to another area and work.
I have reviewed the cold temp procedures from West Systems web site and it appears to be difficult to maintain proper epoxy working temperatures while working outside in the boatyard with limited facilities.
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Old 02-15-2001
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cast iron keel coating

Don''t forget the rust converter...any hardware store will have it. About the temp.; I''ve seen people put up tents around their boats and bring in propane or kerosene heaters, and as you can guess-----it works!!!......Rev.
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Old 02-16-2001
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cast iron keel coating

Reading you latest posts, I would suggest as a better alternative that once you gave gotten as much of the old filler off as you can, rent a sand blaster and blast the keel "white". I would at that point very quickly roll on a barrier coat. In my mind that would ideally be straight epoxy or an epoxy based primer. I would avoid any other primer except posibly a zinc rich epoxy or a coal tar epoxy if you intend to coat the keel with epoxy afterward.

I would try to coat the keel in one session since the "laps" between cured and new epoxy are not as waterproof as a single continuous layer.

Jeff
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Old 02-16-2001
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cast iron keel coating

Cost is the primary factor on this repair. i can grind and sand on the iron on my own but it is going to be small batch coatings until I get the whole keel coated.I checked on the different epoxy brands and it looks like there are compatibility issues.
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Old 02-20-2001
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cast iron keel coating

Well maybe you should skip the epoxy. Do a rust conversion, that''ll take care of the sealing then just paint it with anti fouling. Next year you may need to do a touch up, but it''ll be done for now.
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Old 02-20-2001
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cast iron keel coating

Mike--the problem is that the keel has to be faired into the fiberglass above the keel. It looks like the ''dutch'' cast iron was not perfect coming out of the mold. It has a deep gouge on one side about 2 inches below the keel/hull seam. This was faired with fiberglas when they built the boat and only showed when I stripped the failed covering.
The keel is very close to the hull sides until you get about 2ft away from the bow then it varies up to an inch or more.
I found out today that Mas epoxies can be used with rustlock metal prep so I''m coating the keel with the metal prep then sand, dry!!!! and then rub in a coat of epoxy to keep the moisture out.
I checked out the boatbuilding.com site and that''s a good source to know about!
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Old 03-03-2001
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cast iron keel coating

I found that the metal prep would not last more than a day before the rust would start again so I''m coating the metal prep with pettit#6980 primer to stop the rust. This is just temporary until warm weather starts but it allows me to grind on the keel and have it sanded and primed .
Rust forms very quickly in one area of the keel because of porosity in the cast iron.I ground out a small area but found that the minute air holes went into the cast iron more than an 1/8 of an inch. Thankfully it seems contained in a one squre foot area.
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