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How many Coats

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Greg S
Deckhand

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14 Posts

Initially Posted - 04/21/2007 : 19:55:04

I'm using West Marine's PCA Gold ablative antifouling paint. I bought two gallons one black and the other blue. My question is How many coats should I use.

What is the recommended amount of coats? This is my last step before installing the keel after having the trunk damaged by a broken cable.

Thanks,
Greg

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ClamBeach
Master Marine Consultant

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3072 Posts

Response Posted - 04/21/2007 : 21:31:20

Two gallons is a quite a bit I usually figure 1 gallon gives 3 nice coats plus a bit extra on the leading edge of the keel and bow areas (high wear). Since you've got that much paint, I'd go 2 base color coats and 3 finish color coats.

IMHO: If you have a trailer with black rubber rollers use black as the finish coat. That way,the roller marks won't show.

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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts

Response Posted - 04/21/2007 : 23:55:57

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by ClamBeach
 ...If you have a trailer with black rubber rollers use black as the finish coat. That way,the roller marks won't show.
<hr height="1" noshade id="quote"></blockquote id="quote">
...when you're broaching.

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dblitz
Navigator

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240 Posts

Response Posted - 04/22/2007 : 10:23:46

I don't know where you sail or how often you get a chance to paint. On the Hudson, where we haul the boats out in the Fall, with one coat of ablative paint, you're done. Not only that, but putting on more coats just makes for more removal when the time comes to strip it down, not that you'll have to strip ablative that often.
My fin keel needed just over half a gallon of paint, I can't see where you would need to put 2 gallons of paint on all at once. The good news is if you haven't stained the can with paint, you can return it.

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ClamBeach
Master Marine Consultant

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3072 Posts

Response Posted - 04/22/2007 : 11:43:55

"...when you're broaching. "

Indeed... nothing more embarassing than a broach with a dirty bottom.

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John Russell
Master Marine Consultant

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USA
3444 Posts

Response Posted - 04/22/2007 : 11:47:59

When in grad school, the best advice I ever got was "Stop when you get an "A"". Two gallons sure seems like a lot of extra credit to me. Not to mention extra weight.

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Greg S
Deckhand

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14 Posts

Response Posted - 04/22/2007 : 19:59:23

After finishing the repairs to the keel trunk I had right
many blisters to repair, while I was working on the barrier
coats I read and article about using two different colors
of bottom paint. It stated that once the bottom coat starts
to show then it's time to repaint. Listen to the employees
at west marine they said it would take about two gallons.
After painting the first coat I noticed that I had about 3/4 of
a gallon left so I asked for advice for the forum.

Greg

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bigelowp
Master Marine Consultant

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USA
1815 Posts

Response Posted - 04/24/2007 : 22:22:28

I too am using the same paints and colors for the same reasons -- alternating color to see when painting is needed and ablative is fine for non-racing. I sail on Long Island Sound which has a good amount of scum on the western part. After removing most of the old paint I painted a base coat black and finish coat blue. The boat will be in all summer and next year when she is hauled the bottom will be power washed then the following spring I will use black as the top coat so to alternate. I used far less paint than i expected (or used onmy last boats) so I will make it through a second year easily. Don't ad paint just to use it -- or you will be scraping teh bottom a lot sooner.

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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts

Response Posted - 04/24/2007 : 22:30:29

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by bigelowp
 ...After removing most of the old paint I painted a base coat black and finish coat blue. The boat will be in all summer and next year when she is hauled the bottom will be power washed then the following spring I will use black as the top coat so to alternate...<hr height="1" noshade id="quote"></blockquote id="quote">
Nothing wrong with that, but an alternate strategy is to continue adding blue, using that first black coat as your signal that you're getting a little thin. If you see no black, you have the option of skipping a year (to avoid buildup). Having a couple of coats of blue on top of the black should be good, reliable protection.

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dblitz
Navigator

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240 Posts

Response Posted - 04/26/2007 : 20:06:29

Well said Dave. Just putting a touch up coat of blue on top of the previous one will continue the "idea" with the undercoat of black. John's point about not putting on too much weight is also well made. Even though I'm not weight conscious, when I stripped the ablative of my bottom a couple of week ago, I was really surprised by how much the garbage bags I disposed of weighed.

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ClamBeach
Master Marine Consultant

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3072 Posts

Response Posted - 04/27/2007 : 09:04:13

In a high-fouling saltwater venue I recommend three coats of ablative. No matter what anti-fouling paint you have you'll be doing some periodic bottom scrubbing during the 'hot' season to remove the surface crud.

Your mileage may vary depending on your location... if you're pulling out every Winter one base coat and one top coat to be renewed yearly should work nicely.

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tinob
Master Marine Consultant

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USA
1883 Posts

Response Posted - 04/28/2007 : 15:54:43

There is no reason to remove ablative paints if you intend to repaint with ablative paints.

My boat is going in this spring for the sixth year without repainting. The need to remove ablative paints prior to repainting with other ablative paints is contraindicated until the signal coat shows, and when it shows you power wash the bottom and when dry repaint. That's the beauty of the ablative system. Don't make a simple system complicated.

Val on the hard DAGNABIT, #3936,Patchogue,N.Y.

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Jay Schkloven
1st Mate

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USA
84 Posts

Response Posted - 04/29/2007 : 09:52:21

I have used one gallon of paint each time I painted the bottom. If you are carefully mixing the stuff off the bottom of the can and do spill any, this is enough. I painted two colors one year and never washed the top color off. I put a little extra on the leading bow edges and never had a problem. I used ACT.
Jay

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