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Old 19-03-2008, 20:48   #1
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Green bottom paint?

hello everyone.
I removed all my old bottom paint using a hook scrapper. Right below the water line I have a strip of black paint with a green tint to it. I can't seem to strip this off. It is very very hard. It varies from 2 inches to 4 inches in width. Is there anything I can use (thats safe) to soften this up so I can scrape it off.
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Old 19-03-2008, 20:57   #2
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Are you talking about the bottom paint that has oxidized (copper oxide)??? It sounds like the old bottom paint.

Bottom paint usually has copper in it and over time right at the water surface the black bottom paint can turn green due to the oxygen. The more wave action the wider the band.
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Old 19-03-2008, 21:00   #3
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The green is most likely copper left from old bottom paint. I would use caution scraping. If you were planning on taking it all the way down to re apply a barrier coat(s) then I would use soda blasting, then apply 2 coats of barrier coat and apply new bottom paint.
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Old 19-03-2008, 23:03   #4
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yes its the bottom paint. is it safe to lighty sand this area and then paint over it?
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Old 19-03-2008, 23:43   #5
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You might try Jasco Epoxy stripper. Where gloves and check it often.
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Old 20-03-2008, 07:54   #6
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Very light sanding should be all you need to do. Usually power washing with some scraping if anything was attached that tight is all that is needed. To remove all the bottom paint is going to take away some barrier coat and then you need to reapply that before you paint.
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Old 21-03-2008, 21:46   #7
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how can I know if I took off some or all of the barrier coat?
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Old 22-03-2008, 05:41   #8
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how can I know if I took off some or all of the barrier coat?
You'll see the gelcoat or strands of fiberglass depending how deep it was removed. Most of the time it's another color so it is easier to tell.
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Old 22-03-2008, 06:48   #9
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Could someone enlighten me as to what "Bottom Paint" is? I am not familiar with the term.

Thanks
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Old 22-03-2008, 07:16   #10
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Bottom paint is the outer layer of paint used to prevent marine growth in salt water. It can also be called "anti-fouling" paint being a more accurate term for it.
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Old 22-03-2008, 19:54   #11
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Quote:
Originally Posted by Pblais View Post
Bottom paint is the outer layer of paint used to prevent marine growth in salt water. It can also be called "anti-fouling" paint being a more accurate term for it.
And as we all know, it's still more accurately known as "kinda-slows-down-fouling" paint.
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Old 22-03-2008, 20:06   #12
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"kinda-slows-down-fouling"
Of course because the stuff that really works is so toxic it's banned in most parts of the world.
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Old 22-03-2008, 22:51   #13
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An "American" term then? :-)
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Old 23-03-2008, 07:11   #14
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An "American" term then?
Have you another? I think we did a thread on sailing terms in different versions of english before but I don't recall this one coming up. It does come up a bit though.
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Old 24-03-2008, 07:53   #15
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Hi Paul,

Checked with an ex shipyard collegue. You are right it is used over here too! Though he did say it was called "Bottoms" paint. We are trying to find out why plural.

I have only heard of it as "antifouling"

Cheers

John
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