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Old 19-06-2019, 14:05   #1
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Bottom Paint... Is More... Better?

On our little o'day sailboat, we usually put 2 coats of bottom paint on every other year. It's a somewhat easy task, afterall, it's a small boat, and gets pulled out every year anyway.

But now we are looking at a larger catamaran, and haulouts are expensive. So, when hauled out… would it make sense to put 3 or 4 coats of antifouling on so that we could go longer between haulouts? and if 3 or 4 coats makes a big difference, then why not do 5 or 6? or does bottom paint not work that way..
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Old 19-06-2019, 14:29   #2
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Re: Bottom Paint... Is More... Better?

Follow the manufacturer's recommendation.

Mine gets two coats of ablative and an extra coat at the waterline.
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Old 19-06-2019, 15:03   #3
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Re: Bottom Paint... Is More... Better?

more paint works till it is so thick it falls off so number of new coats also needs to take into consideration how many and what is below it
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Old 19-06-2019, 16:13   #4
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Re: Bottom Paint... Is More... Better?

It really depends on the paint I did 4 coats of self polishing and one extra on the water line , after 8 months of cruising and 8.000 miles you can see the primer .
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Old 19-06-2019, 16:30   #5
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Re: Bottom Paint... Is More... Better?

The conventional wisdom is when using 2 coats, use different colors so the ‘over’ coat will be obvious when it wears off.
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Old 19-06-2019, 16:40   #6
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Re: Bottom Paint... Is More... Better?

Assuming we’re talking ablative paint, then generally speaking yes, the more layers the better. But that assumes it adheres well. We put on three layers the last time we did a major pain job. Bottom layer was red, so we can tell when more is needed.
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Old 20-06-2019, 03:24   #7
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Re: Bottom Paint... Is More... Better?

Quote:
Originally Posted by Mike OReilly View Post
... We put on three layers the last time we did a major pain job...
Mike really says what he means, even when he doesn't.
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Old 20-06-2019, 14:26   #8
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Re: Bottom Paint... Is More... Better?

Adding coats of bottom paint won't make it work any better, just last longer. However, thicker and thicker is not good. You'll need to find out how long it lasts for the way you sail and where you sail. The basics are to have a contrasting color next to the hull so you can see when you've lost the layer on top. We pull our boat each year, it's New England. So I have one layer of ablative over my contrast coat. It will last two summers for sure. The third summer depends on how often and far we sail and how "rich" the environment is in a given year. "Rich": meaning how much grows on the hull over the summer. Some years are worse than others. Once I have a heavy coating of hard growth, I apply a complete new layer. This last year, the second year for the current coat, we had little to no hard growth so I just touched up the parts where the contrast layer shows through and redid the waterline.
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Old 20-06-2019, 19:59   #9
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Re: Bottom Paint... Is More... Better?

Quote:
Originally Posted by scarlet View Post
On our little o'day sailboat, we usually put 2 coats of bottom paint on every other year. It's a somewhat easy task, afterall, it's a small boat, and gets pulled out every year anyway.

But now we are looking at a larger catamaran, and haulouts are expensive. So, when hauled out… would it make sense to put 3 or 4 coats of antifouling on so that we could go longer between haulouts? and if 3 or 4 coats makes a big difference, then why not do 5 or 6? or does bottom paint not work that way..
More can be better depending on your type of boating and type of vessel.
However, harder paints stay on longer and cost more as well take more prep to apply.
I personally use no paint and scrape before I sail.
My diver thanks me for the work and I can do it myself if I choose.
No paint is best for the environment.
Cheers
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Old 20-06-2019, 20:08   #10
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Re: Bottom Paint... Is More... Better?

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Originally Posted by gmakhs View Post
It really depends on the paint I did 4 coats of self polishing and one extra on the water line , after 8 months of cruising and 8.000 miles you can see the primer .
So, do you think that you used the wrong paint? Did you strip the old paint off, and start fresh? or did you add to what was there? and if so, do you know what was there in the first place?
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Old 03-07-2019, 16:25   #11
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Re: Bottom Paint... Is More... Better?

Some of my bottom paint came off in patches... assuming it was a couple three coats. Blue underneath the multiple coats of red showed, so I sanded the whole hull to fair and try to improve adherence of my new coats.
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Old 03-07-2019, 16:47   #12
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Re: Bottom Paint... Is More... Better?

The two times we applied 4 coats it was worth the money.


Mind we sail thousands of miles between haul-outs.


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Old 06-07-2019, 03:26   #13
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Re: Bottom Paint... Is More... Better?

Quote:
Originally Posted by Mike OReilly View Post
Assuming we’re talking ablative paint, then generally speaking yes, the more layers the better. But that assumes it adheres well. We put on three layers the last time we did a major pain job. Bottom layer was red, so we can tell when more is needed.
Ive always depended on the hobbly-gobblies in the water to tell me when more is needed. When they come to stay, more is needed.

I use three coats of soft ablative, normally last two years between haul-outs. But this time I have a good layer of small barnacles from the waterline down about a foot after just 18 months. Same paint, same environment, same cruising regime. Obviously the paint quality this time round was not so good. Or maybe the paint manufacturers are helping me develo my “save-the-planet” plan.
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