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 Mystery Stains		  New Topic  Topic Locked
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Bones
Deckhand

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4 Posts
Initially Posted - 07/06/2010 :  20:40:06  Show Profile
Greetings all. I know the topic has come up before but having tried most of the remedies posted here I think I may have something a bit different.

I've been resurrecting a 1986 C-25 for the last few months and have come across some stains that just won't go. They are found on the external bulkheads in the forward end of the cockpit and along the cabin where the teak 'eyebrows' were installed. All are below teak fixtures or former teak fixtures in the case of my eyebrow teak which was missing when I bought the boat. The stains have a raised texture to them.

I've tried everything from soft scrub and comet cleanser to oxalic acid on them and while it helps a bit the stains won't go away. Leave them a month and they come right back. The fiberglass 'pro' at my shipyard could offer no illumination as to what they are or how to get rid of them so I thought I'd see if anyone else has encountered this.

Water intrusion?
Something leaching from the teak?







She does have a prettier side tho:


Cheers!
Keith
S/V Zatara
1986 C-25 FK/SR #5484
Pensacola
Edited by - Bones on 07/06/2010 22:07:31

calden
Navigator

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USA
194 Posts
Response Posted - 07/06/2010 :  22:41:25  Show Profile
Wow, pretty ugly. My first thought was possibly teak oil, applied then rained on before it had a chance to set up, but the stain patterns don't confirm that. You could try VERY lightly wet-sanding a little corner to see if it gets it off. I mean starting with something really fine, like 400 or 600 grit. If it seems to get it off, then work up to 800, then 1200, then polish. If all else fails you could paint it.

Or just live with it and that beautiful hull and go sailing.

Carlos
Edited by - calden on 07/07/2010 07:54:34
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OJ
Master Marine Consultant

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USA
4382 Posts
Response Posted - 07/07/2010 :  04:15:31  Show Profile
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by calden</i>
<br />. . . If all else fails you could paint it . . . <hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">Or apply another layer of gel coat . . .

Seems like you've tried all the right cleaners. Looks like the factory mold wasn't properly prepared.
Edited by - OJ on 07/07/2010 04:21:09
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britinusa
Web Editor

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USA
5404 Posts
Response Posted - 07/07/2010 :  07:09:27  Show Profile  Visit britinusa's Homepage
From the pics, the port and starboard cockpit seats would seem to indicate that it 'grew' upwards. And from the side view, it appears to have grown or flowed down from the line organizer. Weird that it seems to have missed the underside of the teak rail that has been removed.

So I concur with Carlos and OJ: try a bit more agressive removal, and if that fails, then next time the boat is out of the water it's time for a refinish.

Paul
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John Russell
Master Marine Consultant

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USA
3444 Posts
Response Posted - 07/07/2010 :  07:33:17  Show Profile
I'd be wondering how wet the core is underneath. Maybe time for a core sample? Maybe you could take out one of the bulkhead instruments and see if the core is wet.
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DaveR
Master Marine Consultant

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USA
2015 Posts
Response Posted - 07/07/2010 :  08:42:56  Show Profile  Visit DaveR's Homepage
Sure is a beautiful shiny hull though
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dmpilc
Master Marine Consultant

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USA
4593 Posts
Response Posted - 07/07/2010 :  12:44:49  Show Profile
Looks like some kind of nasty, oily liquid collected at the front of the cockpit and was splashed up the bulkhead wall. Try a good degreaser cleaner with extra bleach added. If you have a pressure washer with a soap dispenser, put the solution in there and blast it.
Also, a PO may have used a Murphy's Oil Soap mixture on the teak and tried to use the same on the hull. Not a good idea (don't ask me how I know).
Here, we get jet fuel exhaust from a nearby commercial airport that leaves black soot flecks all over the boat. Another reason why I have the almost full boat cover on Recess.
Edited by - dmpilc on 07/07/2010 12:46:02
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Prospector
Master Marine Consultant

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Canada
3159 Posts
Response Posted - 07/07/2010 :  19:34:56  Show Profile  Visit Prospector's Homepage
I was thinking oily too, but on a different note. I wonder if the PO "oiled" the FG to get a shine in it. A petroleum based cleanser may have soaked into the gelcoat, and looked real good for a month before doign that to the boat. In teh spots where it evaporated fsast enough (up high) it may not have caused as much damage as lower spots where it could have run or not caught teh sun as fast. Woulda looked real shinet for a day or so though.

Not sure how you would repair that or the effects though, so no help anyway.

i am thinking if they wiped down the dull FG with varsol or pine oil or something like that.
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Dave5041
Former Mainsheet Editor

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USA
3758 Posts
Response Posted - 07/08/2010 :  13:01:49  Show Profile
It might be mildew - gelcoat is porous enough to support it. Common mildew cleaners don't kill it, they just bleach it and it slowly reappears. I think it was in P/S that I recently saw an article about serious mildew cleaners, but I'm away on assignment again and can't check. This is the fourth time I've written this because the stupid hotel wifi drops my connection while I'm typing
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Bones
Deckhand

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4 Posts
Response Posted - 07/12/2010 :  15:08:20  Show Profile
Thanks for the input folks.

Given your suggestions I'm leaning towards it being water/mildew related and am preparing for a session of exploratory drilling and a weekend of rebeding.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.