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post #1 of 9 Old 04-06-2012 Thread Starter
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Cleaning the boat

In another thread someone talked about seeing boats with mold on them. So, I thought I might post some pictures of what could be a worse case. This isn't mold; these are lichens growing on the Gelcoat. Yes, it looks pretty bad. The first instinct would probably be to use a pressure washer. But, I can tell you that a pressure washer will only remove about 2/3rds of what is there; it will not get it clean.
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Re: Cleaning the boat

If you remove the most obvious lichens then you still have a dark coating left behind that looks a lot like mold.
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post #3 of 9 Old 04-06-2012
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Re: Cleaning the boat

What's a lichen?
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Re: Cleaning the boat

But with a little dishwashing liquid and a bit of bleach, it does come off with a brush. It is also on the mast but it wipes off of that too.
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Re: Cleaning the boat

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What's a lichen?
They commonly grow on trees and rocks. Like these:
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post #6 of 9 Old 04-06-2012
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Re: Cleaning the boat

I used to work on a tow boat. A weekly ritual was to wash the entire vessel. Dawn with bleach and water in a pump up pressure bottle like the ones used for pesticide is what we used. It kept the paint bright white until warmer weather allowed us to chip and repaint the entire boat. It works well when/where you're allowed to use it.

Sadly, at my slip, any chlorinated chemical is prohibited.
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post #7 of 9 Old 04-06-2012
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Re: Cleaning the boat

Would bleach do anything to painted deck, or (dark) painted topsides?
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Re: Cleaning the boat

I think we used a latex paint on the towboats. As far as damage to the paint, IDK. If so it wasn't noticeable because we repainted every spring. We would take our solution and spray everything. Where there was stuff growing, it would change color. We'd then take flat broom looking scrub brushes and go to work. The growth came off quite easily and we'd rinse.

I could see a strong concentration maybe having a drying effect but not sure. I flunked college chemistry.
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Re: Cleaning the boat

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Would bleach do anything to painted deck, or (dark) painted topsides?
I wouldn't think you would have that kind of trouble with a painted surface. Gelcoat is a pain because it is porous. But, you know what they say, test a little in an out of the way place before you expose the whole area.
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