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Old 22-02-2011, 11:28   #31
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Re: Little Red Spots on Deck

I have had small brown/red specks on deck that were iron grindings. (The local air pollution) A few quich applications of "Ospho" (Oxalic acid) get this out.. followed QUICKLY by a rinse.

Also had bad stains on deck after the boatyard weeks, from both my, and others, bottom paint grindings. since ALL HARSH CHEMICALS CAN MAKE PERMANENT STREAKS in my new bottom job, I reluctantly did nothing. A month of sun and occasional rain, and they went away.

Only other thought about specs... spidershit! Citra-solv works on them.
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Old 22-02-2011, 11:44   #32
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Re: Little Red Spots on Deck

FSR: WEST MARINE 004_129_002_509 at West Marine

I think Ospho is phosphoric acid. You definitely want to be very careful about leaving that stuff on fiberglass too long.

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Old 22-02-2011, 11:52   #33
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Re: Little Red Spots on Deck

FSR - Fiberglass Stain Remover (Oxalic acid)
Marine and Boating Products by Davis

Ospho is phosphoric acid.
http://www.ospho.com/data.htm
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Old 22-02-2011, 13:59   #34
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Out damned spot! Out I say!

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Did you ever get the spots cleaned off? What did you use?
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Old 22-02-2011, 14:08   #35
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Re: Little Red Spots on Deck

I know that feeling!

The FSR helped about 80%, but I had to leave it on for about 30 minutes. It was a cool, damp day, though and that might have diluted it some. The rest pretty much came off with compound and elbow grease. You will need to re-wax the spots with the FSR, anyway.

Others reported that SoftScrub worked well, but I didn't try it.

It was the non-skid (painted) that was most troublesome. Our non-skid only had about another year left in it, anyway, so we ended up just doing a fresh coat.

Good luck.

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