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Wood Zeppelin
Joined: 09 Feb 2016 Posts: 316 City/Region: Seattle
State or Province: WA
C-Dory Year: 1997
C-Dory Model: 22 Angler
Vessel Name: C-Creature
Photos: Childhood Dream
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Posted: Sat Jun 20, 2020 5:16 pm Post subject: Removing rust stains from fiberglass!? |
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Got a few small rust stains near buttons, roof rails, windlass(or maybe from the anchor chain) antenna bracket, through outside of hull.
Sometimes some lower grades of stainless rust a little in the salt, it seems (?)
I read about soaking the rust stains in a paste of baking soda and water for a bout an hour, then scrubbing. This seemed to work. The same article said to do a wipe with acetone and a rag. When I tried this, it was a disaster. It seemed to have smeared the rust color back into the gelcoat. More baking soda and scrubbing was needed to remove it. So, not sure about the acetone ..(?)
Any better suggestions for cleaning out rust (and other) stains? _________________ James Salay - Real Estate Broker / Investor, Engineer, Artist, Fisherman, Canyoneer, Outdoor Enthusiast
Current boats:
1997 22' Angler - "C-Creature"
1988 16' Angler - "E-fishn-C" (Project boat)
1997 16' Cruiser - "Wet-a-Net"
Also:
14.5' Drift Boat - "Wood Zeppelin" |
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TyBoo
Joined: 23 Oct 2003 Posts: 5315 City/Region: Warrenton
State or Province: OR
C-Dory Year: 1996
C-Dory Model: 25 Cruise Ship
Vessel Name: TyBoo
Photos: TyBoo
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Posted: Sat Jun 20, 2020 5:54 pm Post subject: |
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Barkeeper's Friend works for me. A wet rag and some scrubbing usually does it.
I hadn't heard of the baking soda paste and wait method. Maybe I will try that next time. I think everything is cleaned up pretty good right now but tomorrow there will probably be something else! _________________ TyBoo Mike
Sold: 1996 25' Cruise Ship
Sold: 1987 22' Cruiser |
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Pacificcoast101
Joined: 29 Sep 2007 Posts: 718 City/Region: Torrance
State or Province: CA
C-Dory Year: 2008
C-Dory Model: 255 Tomcat
Vessel Name: No Pressure
Photos: No Pressure
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Alyssa Jean
Joined: 02 Nov 2003 Posts: 2375 City/Region: Guemes Is.(Anacortes)
State or Province: WA
C-Dory Year: 2005
C-Dory Model: 16 Angler
Vessel Name: Alyssa Jean
Photos: Anna Leigh and Alyssa Jean
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Posted: Sat Jun 20, 2020 6:19 pm Post subject: |
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I have always used Barkeepers Friend. _________________ David and Kate
Alyssa Jean 16 Angler
Anna Leigh 22 Cruiser Sold 2005
Anna Leigh 25 Cruiser Sold 2014
K7KJR C-Brats #51 |
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Pat Anderson
Joined: 02 Nov 2003 Posts: 8555 City/Region: Birch Bay, WA
State or Province: WA
C-Dory Year: 2005
C-Dory Model: 25 Cruiser
Vessel Name: Daydream
Photos: Daydream and Crabby Lou
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Posted: Sat Jun 20, 2020 6:36 pm Post subject: |
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This is the no-fail commercial product.
FSR - Fiberglass Stain Remover. You can find equivalent recipes on the web. The active ingredient is oxalic acid, so gloves are definitely recommended.
I would tend to shy away from anything abrasive, and I believe Barkeeper's Friend is an abrasive? Tell me if I am mistaken here.
_________________
DAYDREAM - CD25 Cruiser
CRABBY LOU - CD16 Angler (sold 2020)
Pat & Patty Anderson, C-Brat #62!
http://daydreamsloop.blogspot.com
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ken westrope
Joined: 21 Mar 2008 Posts: 31 City/Region: ephrata
State or Province: WA
C-Dory Year: 2008
C-Dory Model: 25 Cruiser
Vessel Name: c-knight
Photos: C-Knight
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Posted: Sat Jun 20, 2020 9:31 pm Post subject: |
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Barkeepers friend is oxalic acid no abrasive or so it says on the labeL |
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thataway
Joined: 02 Nov 2003 Posts: 20858 City/Region: Pensacola
State or Province: FL
C-Dory Year: 2007
C-Dory Model: 25 Cruiser
Vessel Name: thataway
Photos: Thataway
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Posted: Sun Jun 21, 2020 9:58 am Post subject: |
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Cheapest is to buy crystals of Oxalic Acid; Amazon and Walmart is $20 for 5#, a lifetime supply, just dissolve in water. Ace and True Value have it but more expensive.
I use a lot of Bar Keeper's friend content: feldspar, linear sodium dodecyl benzene sulfonate (DDBSA) and oxalic acid.
Even if some places say Bar keeper's friend is non abrasive, feldspar is a very mild abrasive.
Quote: | Softer still is feldspar (Mohs 6), which is most famously used in the Bon Ami brand household cleaner. For the most delicate polishing and cleaning work, such as with jewelry and fine crafts, |
Acetone is a very bad idea--as you found out. It softens the gelcoat layers and the stain can become permeant. You need to polish it out. _________________ Bob Austin
Thataway
Thataway (Ex Seaweed) 2007 25 C Dory May 2018 to Oct. 2021
Thisaway 2006 22' CDory November 2011 to May 2018
Caracal 18 140 Suzuki 2007 to present
Thataway TomCat 255 150 Suzukis June 2006 thru August 2011
C Pelican; 1992, 22 Cruiser, 2002 thru 2006
Frequent Sea; 2003 C D 25, 2007 thru 2009
KA6PKB
Home port: Pensacola FL |
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Pat Anderson
Joined: 02 Nov 2003 Posts: 8555 City/Region: Birch Bay, WA
State or Province: WA
C-Dory Year: 2005
C-Dory Model: 25 Cruiser
Vessel Name: Daydream
Photos: Daydream and Crabby Lou
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Posted: Sun Jun 21, 2020 6:41 pm Post subject: |
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Not sure of the exact proportions I used, but I did thicken it with wallpaper paste so it would stick when I put it on until I was ready to rinse it off. Make sure not to get it on your galvanized trailer (don't ask how I know, just take my word for it). Here is a recipe I just found that looks pretty much like the one I had before. it worked for me as well as FSR, great for removing rust stains:
Put 1 quart of hot tap water in a container (a bucket, for instance).
Measure 100 grams (about 4 ounces) of oxalic acid.
Stir the oxalic acid into the hot water.
Let the mixture cool and it's ready to use.
Optional: if you want it to "stick" better to a surface, you can add up to 10 tablespoons of powdered wallpaper paste. |
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tsturm
Joined: 01 Nov 2003 Posts: 1135 City/Region: Soldotna
State or Province: AK
C-Dory Year: 2003
C-Dory Model: 25 Cruiser
Vessel Name: JMR TOO
Photos: JMR-TOO
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Posted: Sun Jun 21, 2020 10:17 pm Post subject: |
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Pat Anderson wrote: | This is the no-fail commercial product.
FSR - Fiberglass Stain Remover. You can find equivalent recipes on the web. The active ingredient is oxalic acid, so gloves are definitely recommended.
I would tend to shy away from anything abrasive, and I believe Barkeeper's Friend is an abrasive? Tell me if I am mistaken here.
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Any type of polish is abrasive or it won't do any thing
Barkeepers is powdered oxalic acid & good stuff. Keep it off your concrete. |
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