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 how many layers of bottom paint?		  New Topic  Topic Locked
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cmckitrick
Navigator

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USA
119 Posts
Initially Posted - 06/13/2004 :  07:05:54  Show Profile
I am getting my '81 C25 ready to launch and put a layer of micron csx on the bottom. I intended to put another coat on but my brother in law/PO thought I was nuts. He said that stuff is expensive and you don't want layers to build up. I just figured the can said put at least two coats and I know that it is made to slough off to guard against build up. What do most people do? Thanks.
Charlie McKitrick
Norwell, MA
Valiant Lady... for now
'81 C 25 SR/FK
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Dave Laux
Captain

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318 Posts
Response Posted - 06/13/2004 :  07:39:18  Show Profile
Must be handy having your brother in law be your probation officer. You are supposed, if you were starting with a fresh clean bottom,to put on a tie coat, then to put one coat of a diferent and contrasting color from what you want to end up with. Then put 2 to 3( I use three) coats of the color you want. Then leave it alone except for washing until the other color begins to show. Then paint mostly the worn areas and lightly the rest. I have not added paint to our boat bottom for at least three years except to touch up the keel. The point of the stuff is that it doesn't build up. Dave
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cmckitrick
Navigator

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USA
119 Posts
Response Posted - 06/13/2004 :  07:47:18  Show Profile
I am starting with paint already on. what is a tie coat?
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Dave Laux
Captain

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318 Posts
Response Posted - 06/13/2004 :  08:37:32  Show Profile
Its a chemical bonding coat that breaks up the release wax coat that is on a new hull. If you are painting over old paint its not relavent. Dave
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Steve Milby
Past Commodore

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USA
5913 Posts
Response Posted - 06/13/2004 :  09:12:51  Show Profile
The way you paint your bottom depends on how and where you plan to use your boat. If you race, you'll sand and paint it every year.

If you sail in the north, where the sailing season is only 5-7 months long, you don't need 2 layers of bottom paint, regardless of whether you race or not. One layer will get you through one season without accumulating much build-up over the long term. By lightly sanding the bottom before applying the next layer, you help to prevent paint build-up.

If you sail in warmer waters, and leave the boat in the water year around, non-racers should apply two full coats of bottom paint each year or two.

There's nothing wrong with painting over old paint so long as you sand the old paint smooth before applying the new coat, and so long as the old paint build-up doesn't become too thick. When old bottom paint becomes too thick, it sometimes blisters and peels off, especially from the keel.
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ClamBeach
Master Marine Consultant

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3072 Posts
Response Posted - 06/13/2004 :  10:08:56  Show Profile
As you've noted, an ablative paint is designed to wear away, exposing fresh anti-fouling chemicals and shedding crud as it does.

With this sort of paint, more coats = longer time before repainting. I usually put on two or 3 coats... but it the fouling rate here in Humboldt Bay is incredible, almost like the tropics.
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Randolph G. Wilson
1st Mate

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USA
64 Posts
Response Posted - 06/14/2004 :  14:39:16  Show Profile
This is an interesting thread. I bought my boat two years ago. It had been hauled, blisters repaired and repainted a year earlier. My question is, how often should the bottom be repainted? I sail in Lake Lanier near Atlanta. I won't do the work myself, so it's a fairly expensive operation.
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Dave Laux
Captain

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318 Posts
Response Posted - 06/14/2004 :  16:53:39  Show Profile
Randolph, what kind of paint do you have on the boat? Different paints require different recomendations.
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Randolph G. Wilson
1st Mate

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USA
64 Posts
Response Posted - 06/16/2004 :  15:20:48  Show Profile
My bottom pain is Trinidad. It was applied in November 2001. Should I have it done again now? I brush cleaned the bottom (in the water)last summer and it looked pretty good.
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Steve Milby
Past Commodore

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USA
5913 Posts
Response Posted - 06/16/2004 :  15:41:13  Show Profile
If you're satisfied with the performance of your boat, and if it's not peeled, worn away, or caked with dirt or algae, you could probably get away with not painting it, but I suggest painting it every 3 years, whether it appears to need it or not. In that period of time, you start accumulating lime and other waterline scum that gets harder to remove with age.
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Dave Laux
Captain

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318 Posts
Response Posted - 06/16/2004 :  17:24:10  Show Profile
If you can put ablative paint over the Trinidad I would. I would want to check about compatability but the idea of scraping off old paint is very unattractive to me. Dave
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thacket3
Navigator

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USA
101 Posts
Response Posted - 06/17/2004 :  11:53:59  Show Profile
When I had my C-25 hauled out at Aqualand to be transported to Miami, I had a guy do the bottom job for me in Gainesville. Did an incredible, honest job. Even went out of his way and took care of a few other minor issues. If you need a recomendation, let me know.
Tim

Jss144@hotmail.com
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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.