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Old 29-04-2014, 05:15   #1
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Stains Bleeding through Paint

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Any idea what this is? Polyester foam core with paint, no gelcoat. Looks like rust but nothing metal below the paint. Shows up throughout the cockpit and decks.


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Old 29-04-2014, 06:42   #2
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pirate Re: Stains bleeding through paint

Check for electric seepage from somewhere in the area.. had similar in a Bendi.. turned out it was a bit of bared wire where the coating had worn through.
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Old 29-04-2014, 07:26   #3
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Re: Stains bleeding through paint

When an angle grinder is used nearby (on steel, obviously) the sparks, which are moving at close to 200mph and are white hot, can hit a surface hard enough to slightly embed themselves - I've seen car windscreens pitted by sparks. Welding nearby has the same effect but worse.

Even though a surface like FG is later painted the particles can eventually bleed rust through.

I can't see well enough from here to be sure but that's what it looks like to me. You might get away with sanding until all trace of staining is gone and then repainting.
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Old 29-04-2014, 08:34   #4
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Re: Stains bleeding through paint

I think but am not sure you can treat it with Osphoric acid and re-paint if it is embedded steel. It sure looks like it is anyway.
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Old 29-04-2014, 11:54   #5
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Re: Stains bleeding through paint

Ditto on grinding nearby or using a steel wire brush in the area. Oxalic acid or rust remover will take care of the rust stains but it will recur till the ferrous particles are completely oxidized.
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Old 29-04-2014, 20:57   #6
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Re: Stains Bleeding through Paint

Thanks for the replys. I was thinking maybe it was uncured resin leaching out but the metal fragments getting imbedded from grinding makes a lot of sense and something I haven't thought about.


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