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post #11 of 16 Old 12-31-2013 Thread Starter
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Re: Blotches on deck - can you identify

Thanks for all of your contributions. Any additional opinions will be welcomed. I will be compiling them in a brief email to the boatyard that did the work and see what they think.
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post #12 of 16 Old 01-01-2014
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Re: Blotches on deck - can you identify

most 1960s cal and other hand laid fg ¡boats of of 1960s with overzealous owners and former owners become splotchy as the hand laying of glass after the hand painting into the mold of the gelcoat..which was, btw, quite thickly painted into the hull mold, will yield a dark grey to black coloration when gelcoat has been removed or nearly so.
a good surveyor MIGHT know what it is..i do know one who does.... but the yard may not say they know what it is or that it is their fault for over zealous sanding or polishing, which is same as a fine sanding especially when done by machine.


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post #13 of 16 Old 01-02-2014 Thread Starter
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Re: Blotches on deck - can you identify

Here is the answer from the boatyard. Opinions welcomed!

I have seen this staining issue before, it is caused by dirt/contaminates getting in the pores of the gelcoat. As boats age the gelcoat becomes porous which is why they lose there shine. The smooth shiny areas can be waxed to help seal the pores, but not much can be done for the non-skid as waxed non-skid kind of defeats the purpose. What looks like happened on yours is the rain had just enough acid in it to start lifting the contaminates out of the pores and then the boat dried before it was all of the surface, then the sun comes out and bleaches it out after a few days. Depending on if its an organic or mineral stain it can usually be removed with a little bleach and water or a mild phosphoric acid and water. (Just don’t mix the two). Also here are some commercially available products and a description.
The West Advisor: Gelcoat Maintenance

From your pictures it appears its all on the decks not the hull sides. Which is usually the case as the contaminates sit on flat areas.
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post #14 of 16 Old 01-02-2014
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Re: Blotches on deck - can you identify

Are you located anywhere near the Florida Keys or the Biscayne Bay/Miami area?

In my previous post I stated that your (and my) boat rash looked like a bacteria. Well, it seems that the state of Florida has been very actively spraying for mosquitos that carry Dengue Fever and they use two different types of broadcast spray agents: one is a standard but non-toxic insecticide to kill the adult mosquitos, and the other is a BACTERIA to help kill off the mosquito larvae.
This aerosolized bacteria spray could quite possibly be what is on your boat.

This sprayed on bacteria is Bacillus Thuringiensis Israelensis ... the very same bacteria that is used at ski areas to enhance the output of their 'snow guns' - and we ski patrollers and skiers have had the same damn 'bloom' on our automobiles that are routinely parked at ski areas when they they are 'making' snow. The 'blooms' happen especially on those warm (above 32°) days after a long night of 'snowmaking'.

Info: Combating Dengue Fever | Florida Keys Mosquito Control District


Comments from your boat yard reply - If they waxed, then the open 'pores' of the FRG would be filled with wax - and side surfaces of your boat not surfaced with non-skid should not be affected, the pic with the 'windows' showing wouldnt have this 'bloom' showing. If what they stated was logical, they just admitted that either that they didnt do a good job of waxing or that the wax they applied does not 'shed water'. Nice 'dodge' by your boat yard but doesnt pass the 'logic' test.

My suspicion still stands - bacteria as a strong possibility. ;-)

Last edited by RichH; 01-02-2014 at 10:51 PM.
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post #15 of 16 Old 01-02-2014 Thread Starter
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Re: Blotches on deck - can you identify

RichH, i am indeed in Miami. Dinner Key Marina.


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post #16 of 16 Old 01-03-2014
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Re: Blotches on deck - can you identify

I've had rubbing compounds and wax leave behind residue that goes pinkish when they are not properly and fully buffed off or leave oxidation behind.

The grey is probably aluminum oxide - a residue left from rain, air planes dumping fuel and wash down from the mast.

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