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post #1 of 21 Old 11-28-2018 Thread Starter
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Bottom Paint

This is a picture of a typical boat bottom of a certain age.

I know what I tell prospective buyers but just to double check do most of you have boats that look like this?

Do you consider it a big enough problem to soda blast or sand, seal and repaint?
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Last edited by davidpm; 11-29-2018 at 01:10 PM.
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post #2 of 21 Old 11-29-2018
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Re: Bottom Paint

It looks smooth and white to me...

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post #3 of 21 Old 11-29-2018
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Re: Bottom Paint

Your picture of the boat and its bottom paint does not appear to have made it.
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post #4 of 21 Old 11-29-2018
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Re: Bottom Paint

Must be snowing in Wisconsin...a real white out.


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post #5 of 21 Old 11-29-2018 Thread Starter
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Re: Bottom Paint

posted pictures

The lesson from the Icarus story is not about human failing.
It is a lesson about the limitations of wax as an adhesive.
If you have an engineering problem solve it.
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post #6 of 21 Old 11-29-2018
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Re: Bottom Paint

Hey,

That doesn't look so bad to me. I would just sand it down a bit and then paint it. If the paint appeared 'loose' when sanding I would spend a little more time in that particular area.

My old O'day needed sold blasting. See the before and after pics

Barry
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post #7 of 21 Old 11-29-2018
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Re: Bottom Paint

So what do you tell people David ? Because I'm a DYI guy and have a yard that let's you work on your own stuff , I have seen it done by media blast , chem strip and my favorite RO sand w/80 grit . For the boat in question first IMO it would depend on the water line length . For a large boat with a build up and flaking like that I would go with blast . I have heard stories about chem strip that the bottom paint didn't like the chem and didn't stick . That of course would mean the prep was no good .

Westsail 28 , Patricia A
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post #8 of 21 Old 11-29-2018
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post #9 of 21 Old 11-30-2018
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Re: Bottom Paint

Iíve tried to partially strip the bottom paint over multiple boats during the past 45+ years in an attempt to avoid a compete stripping (and paying someone else to do it.) It was never a very satisfactory process and it seemed there was always more partial stripping the next year to get a good base for the bottom paint.

I gave up on 2 boats over the past 28 years and hand-stripped them once I discovered carbide scrapers. In both cases barrier coat was applied before doing the antifouling and the results were outstanding: multiple years of hassle-free spring commissionings.

Then, about 3 1/2 years ago I sprung for a walnut shell blasting of my 35 footer. It was a great decision. Barrier coats were applied before finishing up with 3 coats of ablative bottom paint. Next spring will be season #5 since the bottom job and, once again, there will be no significant prep before applying a light maintenance coat of antifouling. There is absolutely no flaking or peeling.

If you are in it for more than 5 years, a professional bottom stripping is worth the money, IMHO.
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post #10 of 21 Old 11-30-2018
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Re: Bottom Paint

Clearly, there are original coats that are detaching and being painted over. This is like an Alzheimer or MS diagnosis. You can probably live with it for now, but today is the best day of the rest of it's life. Hope that wasn't too morbid an analogy.

When I get a new to me boat, one of the earliest things I do is have the bottom taken down to the gelcoat. Build the barrier, primer and paint back up properly, sand and recoat on a proper routine and I've never had this problem. Is it cheaper that way? It depends on how long one will own the boat and the time it will take to constantly patch up the failing bottom paint. There is no doubt a proper bottom paint job will perform better.
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