[Public-list] orange stains

[brooks.glenn at comcast.net]

I just read Villo's message again,, about orange stains INSIDE his hull....

I exp;erienced similar sounding (Orange) stains in the paint, all over the inside of my cabin top in main saloon, focusle and head areas, this past spring.  Each one of these spots grew a health crop of mildew/ mold last winter. 

I started probing after I cleaned them up and painted over them this spring and the mold grew back.  Found each orange splotch was indeed an incubator for mildew/mold spolches and found they were imbeded in the original layer of paint throughout the interior side of the coach roof of the boat--The oldest layer of paint looked like old time marine enamel. My orange spots grew out through 3-4 layers of interior marine paint, from this original layer ( not the first under coater).  So maybe if Villo's orange spots aren't rust, then perhaps they are some kind of mold growing from the oldest paint layer out to the surface.  

BTW, I stripped and sanded the main cabin down to the FG, and got rid of every orange splotch before repainting... Haven't had any trouble with the new paint, even though the focsle spots are still growing like a petri dish. another Winter project I guess.

gpb 

 
 -------------- Original message ----------------------
From: George Dinwiddie <gdinwiddie at alberg30.org>
> brooks.glenn at comcast.net wrote:
> > Try a product called Ospho, its a green liquid which chemically
> > alters iron oxide into iron phosphate, which is dusty white in color
> > and can be somewhat scrubbed off.
> 
> According to the manufacturer, "OSPHO causes iron oxide (rust) to 
> chemical change to iron phosphate - an inert, hard substance that turns 
> the metal black. Where rust is exceedingly heavy, two coats of OSPHO may 
> be necessary to thoroughly penetrate and blacken the surface to be 
> painted. A dry powdery, grayish - white surface usually develops; this 
> is normal - brush off any loose powder before paint application."
> 
> I think the loose powder is excess Ospho, and by-products of it giving 
> up it's phosphorous to the iron oxide.
> 
> I wouldn't recommend it for cleaning rust stains on fiberglass.  The 
> usual recommendation for rust stains is oxalic acid.  The cleanser ZUD 
> contains this, but is also abrasive.
> 
> >  -------------- Original message ----------------------
> > From: Villo Marmei <marmei_v at pathcom.com>
> >> Now that we are on this subject....
> >> How does one remove Iron Rust stains ?? Some one, way back must have ground 
> >> some iron inside my lockers and the wall have a fair amount of this orangy 
> >> ugly stains.
> 
> I'm not convinced these are rust stains.  It's not uncommon for water 
> penetration to leach compounds through the fiberglass, whether from 
> byproducts of the resin, a rotting core, or the auto-body compound that 
> Whitby often used for interior fairing.
> 
>   - George
> 
> -- 
>   ----------------------------------------------------------------------
>    When I remember bygone days                         George Dinwiddie
>    I think how evening follows morn;            gdinwiddie at alberg30.org
>    So many I loved were not yet dead,           http://www.Alberg30.org
>    So many I love were not yet born.
>                 'The Middle' by Ogden Nash
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> 
> 
> 
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