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Catalina/Capri 25/250 Sailor's Forums

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Bottom paint & barrier coat question

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Doug C.
Navigator

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USA
146 Posts

Initially Posted - 04/22/2004 : 12:20:39

Now that our boat is living in a slip I am trying to decide what to do about bottom paint. It currently has a blue ablative over a barrier coat. This was a fresh water boat before we bought it so I am guessing that the bottom paint is original from factory or dealer (did the factory do bottom paint on new boats?).

The ablative is getting thin and in many areas the barrier coat is visible. After 5 weeks in the slip I can see growth beginning (hull scrubbing is probably this weekends project).

Does the barrier coat have to come off or can new ablative go over it? If the barrier coat can stay does it need prep prior to paint? If the barrier coat can stay, can I use a chemical strip to remove the last of the ablative without damaging the barrier coat?

I would like to do this (or have it done) without using 80 grit in the process. Something about aggressive sanding on the hull concerns me.

Doug & Mo Cavin
1990 C25 TR/WK #6010
"Valkyrie"

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JimB517
Past Commodore

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USA
3285 Posts

Response Posted - 04/22/2004 : 12:55:47

If you paint non-ablative over the ablative I would think the new paint would just come off. However, pressure wash and a quick scrub will probably take the rest off. After all, it's designed to come off. You would be surprised what a pressure wash will do.

You can get your hull cleaned for $25/month by the guy who does Gary and my boats. They do a good job and scrub the minimum required. Depending on how long you stay, that may be all you need. Green growth along the side is common. It's the heavy stuff on the keel that you need to be concerned about.

Driscols will pressure wash it and put 1 coat of paint on for $600. You could always have them use the ablative paint again.

You can have them haul, pressure wash, block, and you do all the painting. Then have them launch. This costs about $400 to have the boat in the yard over a 3 day weekend. Bottom painting is easy. I'll bet we could all help and get 3 or 4 coats on, plus still go sailing on other Fleet 7 boats, over a weekend of your choice. You provide the green scrubbies, paint, throw away brushes/rollers. I will help.

You can help me with mine later this fall. The divers tell me mine is getting thin but good for another year.

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Douglas
Master Marine Consultant

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1595 Posts

Response Posted - 04/22/2004 : 15:26:38

1)Leave the barrier coat alone. It is not the same as the ablative paint. It's probably an epoxy type of paint and needs to be left alone.
2)Dont worry so much about the ablative that is on the boat now. Don't strip it with anything. Especialy not a chemical.
3)Haul the boat Have it pressure washed and do the bottom yourself.
Rough up the areas that are peeling if any with either sand paper or scotchbrite pad. Just rough it up dont sand it all the way down.
4)Get one gallon of Bottom Shield or the chapest bottom paint West Marine has $49 on sale. Add 1/2 of a container of cayenne peper powder to the paint and stir it in.
5)Paint the bottom with it. Put 3 coats near the waterline and about 6" down. I gallon should do your whole boat almost twice.
TIP change the color so when it wears through it will show.

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jhugener
Deckhand

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USA
13 Posts

Response Posted - 04/22/2004 : 15:51:59

Why would you add cayenne peper powder to the paint?

Bay Bee
4046
Mobile, AL

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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts

Response Posted - 04/22/2004 : 16:39:28

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by jhugener
 Why would you add cayenne peper powder to the paint?
<hr height="1" noshade id="quote"></blockquote id="quote">

Some believe it adds additional antifouling properties to their bottom paint. Personally, to enhance my bottom paint, I dance around the hull while tapping chicken bones.

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Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts

Response Posted - 04/22/2004 : 16:59:33

I add a mixture of tin, lead, bismuth, arsenic, and mercury.

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Champipple
Master Marine Consultant

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USA
6855 Posts

Response Posted - 04/22/2004 : 17:01:46

They say that the plants won't grow or attach to the pepper. Save the sanding residue in the spring, add it to your chilli for a cuperous cayenne kick.. -

One other note - no paint will keep everything from growing and attaching to the bottom. Going for a swim with a sponge now and again or pulling it and pressure washing it in the straps a few times a season will work wonders too. Especially if it doesn't cost you anything to have the yard lift it out for an hour...

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Oscar
Master Marine Consultant

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USA
2030 Posts

Response Posted - 04/22/2004 : 20:25:20

You put cayenne pepper on her bottom, that holding tank is going to stink up the whole dock.....

Oh no, the admiral is giving me the look....

Oscar
250WB#618 Lady Kay on the Chesapeake

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Douglas
Master Marine Consultant

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1595 Posts

Response Posted - 04/22/2004 : 23:04:07

The pepper works to prevent anything growing. Works great for me in salt water. If it doesn't work your only out $1.50 and it wont hurt anything unlike adding all that none envioro friendly stuff.

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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.