Anti-fouling paint under the keel - SailNet Community
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post #1 of 40 Old 03-30-2015 Thread Starter
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Anti-fouling paint under the keel

I know it's a bit of a tricky thing to do but I would assume dealer commissioning new boats do their best to paint the underside of the keel. Well, I hauled out today for a quick pressure wash to get her ready for spring and below is what I saw. Should I bitch about it or is that business as usual?






Last edited by Zoya; 03-30-2015 at 09:29 PM.
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post #2 of 40 Old 03-30-2015
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Re: Anti-fouling paint under the keel

Given that you can see patches of grey primer alongside the bare keel itself - I'd say that's just sloppy.

My boat goes back in tomorrow and for sure there'll be a guy standing right next to it armed with a tin of antifoul and a paintbrush ready to get to work the moment she's lifted in the slings.. or the yard will know all about it.

She looks like a beauty - good luck with her.

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post #3 of 40 Old 03-30-2015 Thread Starter
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Re: Anti-fouling paint under the keel

Thanks. I like to be reasonable but don't like to get cheated either...
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post #4 of 40 Old 03-30-2015
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Re: Anti-fouling paint under the keel

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Thanks. I like to be reasonable but don't like to get cheated either...
If you point it out to them nicely, they'll likely just fix it on the spot at no cost to you..

It's really not a big deal - but, yes, it needs to be done and it's reasonable to ask them to do it.

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post #5 of 40 Old 03-30-2015
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Re: Anti-fouling paint under the keel

Yards like to think one can antifoul the bottom of the keel just minutes before splashing. But it really does not work. The paint often blisters of simply falls off. If boatyards knew anything about boats...or cared about and quality service whatsoever...they would not do that.

The cheapskate workaround is to try to clean and sand the keel bottom just before shoring, then try to get an overnight or morning in the slings to dry the paint just before splashing. The proper way is to bargain for multiple lifts to move the shoring. And those lifts must be after the antifoul had cured a day or two. Expensive. That is of course what I do.

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post #6 of 40 Old 03-30-2015
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Re: Anti-fouling paint under the keel

Most yards (at least in my area) give you hang time of an hour or two to coat the bottom of the keel. I know for a fact that it works on Trinidad and Micron 66. boats that I have had with those bottoms look fine when I haul them a couple of years later.

I would be nice, but definitely ask about the lack of paint on the bottom. Not acceptable.
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post #7 of 40 Old 03-30-2015 Thread Starter
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Re: Anti-fouling paint under the keel

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If you point it out to them nicely, they'll likely just fix it on the spot at no cost to you..

It's really not a big deal - but, yes, it needs to be done and it's reasonable to ask them to do it.
Dealer is 200 miles away so, not possibly to have them fix it but thanks all for your feedback, I feel vindicated....
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Re: Anti-fouling paint under the keel

My river has 7' tidal swing, and depth in the lift area varies from 6' to -1' (a foot of mud). So my DIY boat club has a few hours to splash in daylight for a week, and the next week they don't do any splashes. So on the days that they can splash, they try to do ~4 boats in about 2 hours. There is no willingness to allow any boat to hang in the lifts for a few hours, or everyone would demand the same privilege. So our boats never get fully coated under the keel. I do try to paint the bottom of the wings, since they extend out over the edge of the wood bock. But the center of the wing, where the block supports it, never gets paint.

Getting them to lift the boat in the evening (for painting the keel) and spash early the next morning isn't really viable, because they're too drunk in the evening, and too hung over in the morning.


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post #9 of 40 Old 03-31-2015
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Re: Anti-fouling paint under the keel

FWIW, most ablative antifouls do not need to dry before splashing and there is certainly NO issues with putting them on as the boat heads for the water.. after all, general practice for decades was (and still is in many places) to antifoul between tides whilst lashed to careening piles, so the paint was and still is designed to handle that. Indeed some (I can't remember which ones) shouldn't be left too long before getting wet or they won't work properly at all! As in all things paint - read the tin.

The biggest issue after antifouling is always the bit under the straps... but if the yard uses cradles or blocks to sit the boat on, the lifting straps will naturally be positioned on fresh dry paint, so it's simply a matter of making sure someone is nearby with a tin of antifoul and a brush to do the bits under the keel after the boat is lifted and before it hits the water. So long as the straps don't damage the antifoul (and they usually don't), you're all good.

Anti-fouling paint under the keel-imag0349.jpg

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Last edited by Classic30; 03-31-2015 at 12:57 AM. Reason: Updated pic
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post #10 of 40 Old 03-31-2015
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Re: Anti-fouling paint under the keel

Good yards put a large piece of paper between the hull and straps to avoid any damage to fresh anti foul and your freshly waxed hull.


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