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Old 03-15-2008
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Big Honking Rust Stain

My beloved new-to-me fiberglass boat has an unsightly blemish. Someone used the wrong fastener on a fitting and it has bled a huge, brown rust stain onto my coach roof.

Is there any way to get rid of this abomination other than by re-painting? If and when I do re-paint what should I do to this stain in preparation?
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Old 03-15-2008
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Try SoftScrub and a Scotch-Brite pad. May have to do it a few times, but it works for me.
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I've used a product called the "Works" a toilet bowl cleaner usually found in the grocery. Also removes the bow mustache after an ICW run.
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There's a product called 'FSR Fiberglass Stain Remover' available at most marine stores. I use this stuff all the time, especially around the bases of my . stantions. It's a blue colored jell that I apply with an aptly named 'acid brush'. The brushes are the cheap, metal jobs with the black bristles, which I trim to about 1/4" or so. Anyway, I normally don't rave about a product, but this is one of the few that actually does what it's supposed to...you just dab it on the stain and stand back and be amazed.
Don't be tempted to buy the stuff in a spray bottle. You can control where you want the jell to go, not so the liquid.
Howard Keiper
Sea Quest
Berkeley
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You can also try CLR, available at most hardware and grocery stores. It's designed to clean bath tubs and shower enclosures, so should be fine on fiberglass.
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I've been using a product that West Marine sells for a couple of years now on our crab boat for the rust stains from the pots. It's a spray bottle, you spray it on and wait a couple of minutes then hose it off. Rust disappears. Haven't tried it on a stain that has been there a long time like yours, but it seems to work very well, and it's easy.

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Quote:
Originally Posted by thekeip View Post
There's a product called 'FSR Fiberglass Stain Remover' available at most marine stores. I use this stuff all the time, especially around the bases of my . stantions.
I also use FSR (by Davis) for removing tough stains from FRP, including those caused by rust and diesel. Be warned though, the active ingredient is oxylic acid and it will remove all wax as well - so rewax/polish and buff immediately before further staining is absorbed in the gelcoat.
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