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post #1 of 73 Old 10-19-2015 Thread Starter
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Bottom paint how bad is it?

New boat to me just hauled and I am now considering how to do the bottom come spring. I can see flaking paint in many spots and in quite a few spots I can see the white of the hull! I had imagined simply sanding the paint smooth and then re-painting but am now wondering if I need to strip the existing to get it right?
Picture shows the typical condition of the paint in the worst part of the hull.

What do you folks think?

Dan
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post #2 of 73 Old 10-19-2015
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Re: Bottom paint how bad is it?

If the paint is losing adhesion to the gelcoat, which tends to happen when you get a thick buildup of hard non-ablative paint, that does unfortunately mean that the best fix is to remove all the paint, and start again.

The other plan would be to sand it all down, including the bare patches, removing any obviously loose paint, and then paint.

Which route you take would depend on your cost tolerance, level of perfectionism, how long you plan to keep the boat, and so on.

A strip tends to be rather expensive. The best way is a chemical strip. It's rather labour intensive. I think to have my 31ft boat done, cost me about $3500.

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Re: Bottom paint how bad is it?

a couple of more pictures if they help assess the issue.

Mark, I appreciate your feedback and it unfortunately matches my assessment/fear. Dan
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post #4 of 73 Old 10-19-2015
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Re: Bottom paint how bad is it?

Quite honestly, with the absolute lack of integrity in the antifouling paint industry, you'd be much better off not painting your bottom at all and putting your money into a Deck Snorkel, a 12 volt hooka system.
Not only can you use it for keeping your bottom clean, but also any underwater repairs or maintenance you might need to do (even at sea), retrieve stuff dropped in the drink (30 feet or less), but it is a wonderful unit for recreational diving as well.
Beat that with a can of us$300.00+ paint that doesn't do what it's supposed to do!

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Re: Bottom paint how bad is it?

Capta, are you suggesting that I don't need paint at all? I thought that I would have blistering problems if she didn't have a barrier coat. She is a 2000 model year boat so I am not sure if the blistering thing is applicable or not.
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Re: Bottom paint how bad is it?

It's hard to tell from the photos. If you only intend to cruise it and do casual racing, I would suggest that you wet sand it and re-paint it. After a year or two, have it hauled and see if the paint has stayed attached, or if it's peeling. If it's still in good shape, give it a fresh coat of paint. If not, then I'd suggest you strip it.

If you intend to race it seriously, then I'd strip it and paint it.
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Re: Bottom paint how bad is it?

After about 1989 many boat manufacturers applied barrier coats to their boats at the factory. Some of them guaranteed their hulls against blisters for several years, as long as the owner didn't sand or damage the barrier coat. Most boats treated in that way have not had a significant blister problem, and don't need any additional barrier coat. You should ask the manufacturer whether your boat has a factory-applied barrier coat.

Most people paint their bottoms. A few don't. Barnacles begin to attach themselves to the hull in salt water in a fairly short period of time. If you don't get in the water and scrape them early and often, you'll have a hard time getting them all off. I put one fresh coat of ablative antifouling on my hull each year and haven't had a single barnacle in years.
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post #8 of 73 Old 10-19-2015
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Re: Bottom paint how bad is it?

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Capta, are you suggesting that I don't need paint at all? I thought that I would have blistering problems if she didn't have a barrier coat.
Anti fouling paint and a barrier coat are two different things. One retards fouling growth, the other keeps water from penetrating the surface of your hull. Anti fouling paint is not a waterproof coating, BTW.

Anti fouling paint is absolutely necessary, fresh or saltwater, if your boat is not trailered or drysailed.
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Re: Bottom paint how bad is it?

See my thread here (with picture) with a similar problem. I'm not a marine paint expert, but my practice in four years of ownership has been to remove loose paint around the edges of these areas, rough it up a little with sandpaper, then apply Pettit Hydrocoat with a brush to each of these spots (maybe a dozen or so of various sizes after pressure washing). I then apply another coat or two of Hydrocoat to the entire bottom. Every time I've hauled the boat, the bottom is clean except for a light slime, and the paint is in good condition until they pressure wash, at which time similar patches are torn off to re-start the cycle.

I do note that you appear to have more bare hull than I do, which may or may not cause you to choose another route.
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Re: Bottom paint how bad is it?

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Anti fouling paint is absolutely necessary, fresh or saltwater, if your boat is not trailered or drysailed.
Why would you say that? Today's antifouling paint does little to even retard the growth. As you said, it isn't the same as a barrier coat and has no value beyond looking shabby as it falls off.
What's the problem with having the barrier coat as the finish coat? Why waste all that money on something that doesn't do squat? If it actually did what we pay for, you'd have to find another job!

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