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Old 01-05-2015, 07:03 PM   #21
psneeld's Avatar
City: Ft Pierce
Vessel Name: Sold
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Originally Posted by Poach View Post
At some point in our boat's 20 year life under prior management, it got showered with fine steel particles which rusted. It was in a galvanized steel boatshed and my suspicion is that the particles drifted down from the roof. It's in the non-skid grid as well on on the finished fiberglass. Scrubbing with CLR and FSR do not touch it. I don't want to use an abrasive on the fiberglass whether non-skid or skid if I can avoid it. Any thoughts?
Iron Out is a product like CLR but a bit better for rust. It is an acid....but about all that will get rid of rust stains without mechanical destruction.
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Old 01-06-2015, 07:09 AM   #22
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Originally Posted by Tomsmb View Post

Oxalic acid is a good all around cleaner. It is a VERY mild acid. You can get it at hardware stores anywhere just look for "Wood Bleach" It comes in small plastic cup sized containers. It is a dry chemical that you mix with water. I have used it for years to remove the stains in hull gel coat from the water of the ICW. One container has lasted me several years.

Not knowing the source of your stains, there is no telling whether it will do any good, but it will come in handy in the future for cleaning the ICW mustache. I don't believe it can hurt anything. Try it on a small area and let me know.

Generally, no scrubbing is required. Just wipe it on and give it a few minutes to react with the stain. I then rinse with fresh water to neutralize.

Good Luck,


Thanks Tom. I have tried Bar Keepers Friend. It didn't remove the stains, but perhaps your method would result in a higher concentration. What puzzles me is that nothing I've tried has made a dent in the stain. It may be something I have to live with...although I am going to try some of the other remedies mentioned above.

Mike Metts
KK 42-165
Virginia Beach, VA

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Old 01-06-2015, 07:30 AM   #23
City: Burgess
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Oxalic acid is also an ingredient of many rust stain removers you can buy at the marine stores.
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Old 01-06-2015, 12:14 PM   #24
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I have not tied this method but it's on my list of to do's:

This guy does a lot of interesting videos, mostly on gel coat painting.
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Old 01-06-2015, 04:56 PM   #25
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Originally Posted by Rsysol View Post
I have not tied this method but it's on my list of to do's:

This guy does a lot of interesting videos, mostly on gel coat painting.
Second this recomendation (both as to the method and his videos). I've got a brush for my Makita waiting for spring to try this on our cockpit and swim platform.
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