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 Refinishing swing keel Cat 25 81		  New Topic  Topic Locked
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Ginger
Deckhand

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3 Posts
Initially Posted - 06/18/2005 :  20:37:48  Show Profile
Have used a grinder to remove loose paint. Most is down to bare steel. Do I need a primer before bottom paint?
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ronrryan
Admiral

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USA
561 Posts
Response Posted - 06/18/2005 :  21:06:31  Show Profile
Absolutely! In fact, the primer wash is supposed to be put on IMMEDIATELY after grinding, blasting, etc, following a washdown with alcohol/acetone or mfgr stuff, otherwise the new oxidation starts instantly. "When product fails, read can" Ron srsk Orion sw fl
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ClamBeach
Master Marine Consultant

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3072 Posts
Response Posted - 06/18/2005 :  22:48:09  Show Profile
You need more than primer followed by bottom paint.

If you are going to keep the boat, do a full-on below the waterline rust preventative treatment. West Marine offers some... and I think there's some good advice on-line at their catalog site. Also see the Interlux paint site for info.

Another alternative is to do the above marine below the waterline paint job followed by encapsulating the keel in epoxy. That will last quite a while. If done well, the life of the boat.

If you've come this far with it, I'd go all the way.
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existentialsailor
Master Marine Consultant

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USA
1180 Posts
Response Posted - 06/19/2005 :  06:28:41  Show Profile
At my boatyard, our resident sailboat repair guru has found that Interprotect 2000, which is a barrier coat, works the best on these keel for a _FRESHWATER_ lake. No, that isn't what it's designed for but he swears he has found nothing that works or lasts over the years. YMMV.
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tinob
Master Marine Consultant

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USA
1883 Posts
Response Posted - 06/19/2005 :  09:15:30  Show Profile
"When product fails read can"

Ron you're a gas...that one gets the guffaw of the day.

Val on Calista # 3936
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Mark Loyacano
Navigator

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USA
247 Posts
Response Posted - 06/19/2005 :  09:17:01  Show Profile
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by existentialsailor</i>
<br />At my boatyard, our resident sailboat repair guru has found that Interprotect 2000, which is a barrier coat, works the best on these keel for a _FRESHWATER_ lake. No, that isn't what it's designed for but he swears he has found nothing that works or lasts over the years. YMMV.
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">

He is correct. I used it on my keel several years ago and only needed a little touchup in a few areas that were scratched or bumped by the lake bottom.
One caution though - if you fill in areas that were rusted, to smooth out the keel before applying a barrier coat, make sure it is a waterproof substance. Bondo and many automotive bodyfillers are able to absorb moisture.
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Ginger
Deckhand

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3 Posts
Response Posted - 06/20/2005 :  22:01:35  Show Profile
Thanks for your help. I plan to use a wash, a primer then the bottom coat.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.