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 Blue bottom paint coming off?		  New Topic  Topic Locked
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Steve Blackburn
Master Marine Consultant

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Canada
1091 Posts
Initially Posted - 05/27/2007 :  17:49:45  Show Profile  Visit Steve Blackburn's Homepage
My bottom hull and rudder are painted blue. If I gently rub my hand on the hull or when I stow away the rudder my hands are all blue. Like if the paint was blue chalk.

Furthermore, when retrieving the boat at the launch I could see blue paint floating in the water, surely from rubbing on the 2 skids. Same for the front rubber wheel where the bow rests on.

Is this normal?
Steve Blackburn, Calgary, AB
C250WB - 1999 - Hull 396
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John Russell
Master Marine Consultant

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USA
3444 Posts
Response Posted - 05/27/2007 :  18:07:30  Show Profile
I'm pretty sure what you're seeing is the ablative paint doing what it's supposed to do.
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Steve Blackburn
Master Marine Consultant

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Canada
1091 Posts
Response Posted - 05/28/2007 :  00:52:37  Show Profile  Visit Steve Blackburn's Homepage
Yes, it's ablative paint. I remmeber the former owner mentioning that now. My boat original port was in salt water.

So what is the theory behind ablative paint? (or you can point me to an info source?)
Edited by - Steve Blackburn on 05/28/2007 00:53:48
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John Russell
Master Marine Consultant

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USA
3444 Posts
Response Posted - 05/28/2007 :  07:10:46  Show Profile
It essentially erodes and takes whatever wierd stuff stuck to it along with it as it goes. (Barnacles, slime, other marine growth and, oh yeah, hand prints.) Now you know as much as I.
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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts
Response Posted - 05/28/2007 :  11:45:45  Show Profile
Ablative (sometimes called co-polymer) paints offer several advantages:

1. Since they gradually wear away, they don't tend to build up over the years and therefore don't need periodic stripping.

2. Many remain effective from season to season even when stored on the hard over the winter. "Hard paints" tend to lose their antifouling properties in air.

3. When you have plenty of paint on the bottom but want to make it look a little nicer, you can smear it around with lacquer thinner--it'll look and work like new.

For frequent launching and retrieving with a trailer, ablatives can wear away too rapidly, and of course the place where it happens is the most difficult to touch up. But if your boat generally stays on a trailer, that may not be an issue.

Be aware that ablatives and hard paints are generally not compatible with each other. You can never put a hard paint over an ablative, and ablatives often cause hard paints to let go and fall off, creating craters on the bottom. You should stick with one or the other, or strip it all off.
Edited by - Dave Bristle on 05/28/2007 11:47:55
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Steve Blackburn
Master Marine Consultant

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Canada
1091 Posts
Response Posted - 05/28/2007 :  19:24:12  Show Profile  Visit Steve Blackburn's Homepage
Dave, thanks. I'll try the thinner trick soon.
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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.