Gelcoat Mildew-I'm so sick of gelcoat mildew - Page 4 - SailNet Community
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post #31 of 46 Old 02-11-2013
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Re: Gelcoat Mildew-I'm so sick of gelcoat mildew

The LC50 (lethal concentation) for sunfish is 2.8 ppm for Wet & Forget. Copper sulfate, a worse idea, has an LD 50 as much as 100 times lower than that; unlike bottom paint, it is fully soluable and will wash right in.

(when asked how he reached the starting holds on a difficult rock climbing problem that clearly favored taller climbers - he was perhaps 5'5")

"Well, I just climb up to them."

by Joe Brown, English rock climber




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post #32 of 46 Old 02-11-2013
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Re: Gelcoat Mildew-I'm so sick of gelcoat mildew

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I went out and bought some "Wet and Forget" over the weekend. It says on the label something to the effect of not to apply it within 100ft of a stream, lake or other body of water to prevent contamination by run off.
I think that makes it illegal to use in almost all urban and suburban parts of Western WA, since most storm drains around here drain to the area lakes and Puget Sound.

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post #33 of 46 Old 02-12-2013
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Re: Gelcoat Mildew-I'm so sick of gelcoat mildew

The most powerfully effective "conventional" soap I've used is dishwasher soap. I had to clean the dried on green slime etc. on a van that had been in the weather here for years - it washed off like a regular carwashing when I used the dishwasher soap.

It will strip off any scrap of wax or anything like that though so be prepared to re-wax immediately. It also leave your hands VERY "soapy" so wear plastic gloves or it will take hours to rinse your hands of the slipperiness.

Very cool stuff for those jobs that nothing else will touch.

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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post #34 of 46 Old 02-12-2013 Thread Starter
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Re: Gelcoat Mildew-I'm so sick of gelcoat mildew

I've always wondered about dishwasher soap. You can get versions of that stuff that are eco-friendly and may do a similar job.

I really appreciate that this thread includes a lot of sensitivity toward the marine life in our waters. I've been around long enough to remember when motor oil was just dumped in the dirt not far from the water in SoCal. When all manner of super toxic chemicals were dumped directly into LA Harbor after hours to avoid paying to have them dealt with (My family were longshoremen and knew these things).

We've come a long way as a society, and have further to go, and I appreciate that we sailors are increasingly sensitive about the chemicals we use on the vessels we use to explore our magnificent oceans.

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post #35 of 46 Old 02-12-2013
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Re: Gelcoat Mildew-I'm so sick of gelcoat mildew

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I've always wondered about dishwasher soap. You can get versions of that stuff that are eco-friendly and may do a similar job.

I really appreciate that this thread includes a lot of sensitivity toward the marine life in our waters. I've been around long enough to remember when motor oil was just dumped in the dirt not far from the water in SoCal. When all manner of super toxic chemicals were dumped directly into LA Harbor after hours to avoid paying to have them dealt with (My family were longshoremen and knew these things).

We've come a long way as a society, and have further to go, and I appreciate that we sailors are increasingly sensitive about the chemicals we use on the vessels we use to explore our magnificent oceans.
I watched a documentary on San Francisco Bay recently which had film footage from back in the 50's and even the early 60's where the bay was used by everyone as a dump - people would just back their cars down roads that ended at the water and push everything into the water - old appliances, construction rubble, mattresses, tires - everything. It was astounding that it was that bad in my lifetime.

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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post #36 of 46 Old 02-12-2013
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Re: Gelcoat Mildew-I'm so sick of gelcoat mildew

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Anyone else have these orange dots appearing on your boats this winter? It is the first time I have seen them and I'm scratching my head about what they are. They are scattered all over my boat, and there are no obvious solutions other than a growth of some sort.
Are you anywhere near the Boeing plant? Maybe the orange dots are falling off their new aircraft?
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Re: Gelcoat Mildew-I'm so sick of gelcoat mildew

Ha! That explains it! No joke though, my wife and I used to live in Burlingame, CA, which is just south of SFO and our car and yard would get covered in fine black silt from the airplane exhaust. It was gross. Planes passed just a few thousand feet above us.

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post #38 of 46 Old 11-12-2015
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Re: Gelcoat Mildew-I'm so sick of gelcoat mildew

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Thanks for hearing my rant. I know that waxing would reduce the mold, but really, I am a glutton for boat maintenance and punishment, but waxing the entire cockpit and deck of my Gulf 32 is beyond my limits of absurdity! My main approach is to take a Scotch Brite and with water do a wet rubbing. It takes off a fine layer of gelcoat, and the mold with it, and I know it is just a matter of time before I will have to paint the darn cockpt/decks anyway.

Artillery mold????? Damn. I just discovered a bunch of orange dots on my deck, is that it? Looks like rust dots, but isn't. Harder to get off than the black mold. Deeper in the gelcoat.

And yes, I get algae growth too, but not so much.

Black mold, Orange dots, green slime, what's next?
I get the orange spots too. Have you found out what it is ? Tiny dots of it settles at the bottom of the dimples in the nonskid floor. My boat is white. I need help.
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post #39 of 46 Old 11-12-2015
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Re: Gelcoat Mildew-I'm so sick of gelcoat mildew

Wash it off, then wipe it down with a weak vinegar solution 1/4 cup per gal of water. Don't rinse it off. That will kill all of the microscopic spores in the surface of the gel coat. It will smell like a salad for a day or two but it will do the job. I bought one of those hose sprayers and every month or so I just hose it down with a little vinegar. Keep it off any fabric, it won't stain but it will fade it eventually.
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post #40 of 46 Old 11-12-2015
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Re: Gelcoat Mildew-I'm so sick of gelcoat mildew

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.
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