Gelcoat Mildew-I'm so sick of gelcoat mildew - Page 5 - SailNet Community
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post #41 of 46 Old 11-12-2015
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Re: Gelcoat Mildew-I'm so sick of gelcoat mildew

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Originally Posted by jworks View Post
wfis11, I'll try that. Right now I'm testing Dawn, CLR, Tough Stuff, and Pinesol (separately). I've put a drop of each on a "dimple" in the non-skid floor. Letting it sit 15 mins. My hopes on that aren't high. I'll try your vinegar solution if these don't work. I've read elsewhere some people use muriatic acid. They say it won't hurt gel coat if you wash it off immediatey. You can't just wipe something on and rinse off those dimpled floors. Something has got to get down to the bottom of the dimple where the specks are. I have hundreds of them, maybe thousands.
First off, scuffing the gel coat will only make matters worse at it provides a better "foothold" for dirt. That will generate more mildew.

Here's what works for me:
1. Wash the entire area with a solution of Spray Nine mixed with bleach (1/2 cup of bleach per gallon) and let the wash water sit for at least 5 minutes before a thorough rinse. Keep fabrics away from any splash.
2. While the decks are wet, use Woody Wax, which is applied to a wet deck brush and work it into the porous surface and non-skid areas --using the instructions on the Woody Wax bottle for non-skid. Once it is dry, you blast it with a high pressure garden hose stream and then you towel dry everything.

Caution: Until you dry everything off, things will be slippery, including your non-skid areas.

If you are willing to put a little more effort in the short term to avoid more work in the long term, you might buff the smooth gel coat areas with a light compound and then follow up with a good wax, like Collinite 925, and only use the Woody Wax treatment on the non-skid.

If your gel coat is heavily oxidized, the compounding step is highly recommended for your smooth areas. If the deterioration of your gel coat is such that you can't buff it completely smooth, you could just treat everything as if it were non-skid and use the numbered process above.
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post #42 of 46 Old 11-12-2015
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Re: Gelcoat Mildew-I'm so sick of gelcoat mildew

Fallard, someone on another site recommend Lysol Toilet Bowl Cleaner or The Works Toilet bowl cleaner. I just finished. What took me 3 days last year took 15 minutes today. That was to get the hundreds of orange-ish specks off the nonskid. Yes, I am going to compound the nonskid. Then put the wax on. Thanks.
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post #43 of 46 Old 11-15-2015
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Re: Gelcoat Mildew-I'm so sick of gelcoat mildew

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Would not a little bleach do the same thing?
We get spots here (over the winter mainly), whether or not we wax. I pressure spray with a bit of bleach in my sprayer's 'additive' tank. Works just fine, fast too.
I will use bleach as well, usually the Clorox spray and Bleach in the spray bottle. I do know Bleach will remove the invisible oxidizing Stainless needs so if Its even possible keep it off the SS parts of your boat. How about a wash and wax liquid WM has one. I'm with you if its not extremely easy its too much work and cuts into sailing time.
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Re: Gelcoat Mildew-I'm so sick of gelcoat mildew

I found the answer to my problem. To take the tiny dark orange specks out of my nonskid floor someone suggested Lysol Toilet Bowl Cleaner or The Works Toilet Cleaner. It worked great ! Nothing else I found worked. The specks, whatever they were, settled in the bottom of each dimple in the nonskid floor. All other things I tried would not dissolve them. Not even gasoline. I poured the Lysol Toilet Bowl Cleaner on, spread it around, let it foam up some, and let it sit about 5 minutes. Scrubbed afterwards and rinse it all out the back of the boat with a water hose and they were gone. Success, finally. On one place I let the Lysol sit a bit too long and it left a light blue stain on the white floor. I sprayed some Insta Gone on it and the stain was gone in 10 seconds. Insta Gone is a product that smells like a really strong bleach. Whatever anyone tries to get this stubborn stuff out should be rinsed off immediately with a water hose. Someone I talked to told me it was "pine spores". I don't think pine trees have spores but he may well be right that it was something off the pine trees --- very small and carried by the wind.
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Re: Gelcoat Mildew-I'm so sick of gelcoat mildew

The problem with virtually all methods of removing mildew with a cleaner, is that same cleaner will remove the wax from your hull (or whatever make be waxed). I try to get this done, before the spring wax, but then can't do so again all season. In some small areas, I will try to clean, then wipe down really well with a wet rag, to remove the cleaner. Otherwise, it just runs off with the next hose and I can see the missing was streaks against the blue hull. They may be less noticeable on white, but removing the wax is still removing a protective layer.


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post #46 of 46 Old 11-15-2015
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Re: Gelcoat Mildew-I'm so sick of gelcoat mildew

No-one mentioned On & Off - I used it for the first time this year on the scum line and mustache on my hull as well as cleaning a bunch of rust stains out of the anchor locker. Also on some other marks & stains of various kinds.

It works amazingly well.

I, myself, personally intend to continue being outspoken and opinionated, intolerant of all fanatics, fools and ignoramuses, deeply suspicious of all those who have "found the answer" and on my bad days, downright rude.
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