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Old 12-02-2015, 04:19 PM   #1
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What To Use On Deck Rust Spots

Can anyone recommend a product to remove rust spots that form on the gel coat deck?
I have used Star Brite "Rust Stain Remover" by dipping a Q Tip into the solution and placing it on the spot to soak. It does remove most of the rust spot after some time but is there a better product available?
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Old 12-02-2015, 04:43 PM   #2
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Try oxalic acid or Bar Keepers Friend. Bar Keepers is similar to Soft Scrub but has an acid in it so don't get too aggressive.

Edit: Both are probably pretty similar to the Star Bright product.
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Old 12-02-2015, 04:44 PM   #3
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A better product? Probably not. Most acid products will remove rust stains but the trick is to have the correct acid strength but no more.


Hull cleaner is acid and will work as well. I had some rust I wanted to remove but my hull cleaner was at home. I had a container of "Spotless Stainless" (used to remove fust from stainless steel). It did the trick on the rust on my gelcoat.
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Old 12-02-2015, 04:51 PM   #4
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have had luck with Iron Out.... usually sold right next to CLR type cleaners if you haven't heard of it.
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Old 12-02-2015, 05:12 PM   #5
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What To Use On Deck Rust Spots

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This stuff has worked well for me. Strong though-- I only use it for small rust "dots". I just dab a tiny but on with a small brush, wipe it off with a paper towel and then rinse with water.
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Old 12-02-2015, 05:17 PM   #6
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This is what's in it. Sheesh. No wonder it works. Lots of acids.

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Old 12-02-2015, 05:33 PM   #7
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This is what's in it. Sheesh. No wonder it works. Lots of acids.

Attachment 47017


That's more variety of acid than a Grateful Dead concert!
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Old 12-02-2015, 06:01 PM   #8
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that's more variety of acid than a grateful dead concert!:d
lol
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Old 12-02-2015, 06:23 PM   #9
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This has worked well for me. I also use it to remove the mustache on the bow. I cut it half and half with water. I think it would still work well if it was diluted twice that. Wipe on wait a few minutes for this to disappear, then rinse. No scrubbing. Its the same deal, acids.
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Old 12-02-2015, 08:53 PM   #10
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My favorite product for removing rust stains is Whink. The active ingredient is hydrofloric acid.
Rust Stain Remover | Rust Stain | Whink Products Company - America's #1 Specialty Cleaner Company, Eldora, IA
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Old 12-02-2015, 08:57 PM   #11
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I recently bought a couple pounds of oxalic acid in powdered form on ebay for about $10. Used it yesterday at 1/4 cup per one gallon in a 1 gallon hand-pump lawn sprayer. It cleared the hull of the tannin stains and cleared the light rust from my ER vents. Next, I'll use it to remove the rust stains on some SS rails and rust spots on the decking from some metal cutting onboard during the summer that, in hindsight, was a bad idea!
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Old 12-02-2015, 09:19 PM   #12
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Oh Al, I'm so disappointed in you. Cutting metal on board, the shame. Next you'll tell us you have steel wool on the boat.
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Old 12-02-2015, 09:25 PM   #13
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I use FSR. Works great on decks and stainless. Follow the directions.



Amazon.com: Davis Instruments FSR Fiberglass Stain Remover (16-Ounce): Sports & Outdoors
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Old 12-02-2015, 09:32 PM   #14
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Spotless Stainless works for me very well...
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Old 12-02-2015, 09:38 PM   #15
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…and rust spots on the decking from some metal cutting onboard during the summer that, in hindsight, was a bad idea! [/QUOTE]

Been there done that Al. I also used oxalic acid. I've heard that lemon juice will work as well but have not tried it.

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Old 12-02-2015, 09:50 PM   #16
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Oh Al, I'm so disappointed in you. Cutting metal on board, the shame. Next you'll tell us you have steel wool on the boat.
Bless me Fr, for I have sinned! It's been 6 months since my last metal grindings onboard. Hey, it seemed like a good idea at the time. I was at anchor and needed 4 pipes shortened by 6 inches to complete the floor support jack installation. So I broke out the tools and finished the work. Now, 6 months later, I still have not finished the clean up!

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I use FSR. Works great on decks and stainless. Follow the directions.
[
I forgot I have some of that onboard. I've used it on rust stain drips from my ER vents. Works great.

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…and rust spots on the decking from some metal cutting onboard during the summer that, in hindsight, was a bad idea!

Been there done that Al. I also used oxalic acid. I've heard that lemon juice will work as well but have not tried it.

Rob
Now that I've got a 10 year supply of oxalic acid, I'll be looking for new uses for this stuff!
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Old 12-02-2015, 10:10 PM   #17
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I second the vote for Wink (spelled Whink above)
Available at any supermarket for use on rust stains on clothing.
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Old 12-02-2015, 10:40 PM   #18
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Well on my steel boat I use a grinder with a wire wheel on the rust spots. Treat with phosphoric acid and then epoxy. I am not sure it will work as well on your fiberglass boat. So YMMV as they say.
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Old 12-02-2015, 10:41 PM   #19
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All my rust spots are from some drilling I did on some metal pipe on board. I didn't know! I don't know shit! 😩
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Old 12-03-2015, 12:07 AM   #20
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Dude, we've all done it, once. You won't do it again. In case nobody told you, never bring steel wool on a boat. If you really need to scrub something, buy bronze wool from your neighborhood marine store.
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