Remove Rust (Black) Stains From Deck 5/5 (3)

This post was updated on January 18, 2022

Nails Rusting On Deck

Nails Rusting On Deck

How To Fix Black Spots on Deck?

We get this question about 50-100 times a year at DeckStainHelp.com. Well, actually consumers want to know what causes the black stains to form around their nails or at the bottom of the metal furniture on their deck. Most are not aware that metal, when it rusts, will turn black in wood.


Rustry Screw From Deck Sanding.jpg

Rusty Screw From Deck Sanding

Nails Rusted on Deck

Nails rusting on a deck is not common but can happen from time to time. We have found that this happens for a couple of reasons.

  • Non-Galvanized Nails were not used during the building process. When a deck is installed you must use Galvanized Treated Nails and Screws or Stainless Steel Nails and Screws to prevent the black rusty spots from occurring around the nails.
  • Galvanized nails or screws were used but over time the protective coating has failed. This could take many years to occur but does happen. We have also seen instances where the floor was power sanded and this shaved or removed the protective coating of the galvanized nails or screw from the top.

Metal Patio Furniture Rusted on Deck

Rust on a deck can also happen from older metal furniture left in place for many years. We have also seen this happen from grills and other metal objects. Always be careful when placing metal objects on your deck and lean towards using aluminum or stainless steel items.

How To Remove Black Rust Spots on Deck

In many cases, you can use a deck wood brightener to neutralize out the rust spots and restore the natural color. This issue with this method is it will not prevent the nails or screws from rusting again once it rains. The only way to stop the rust from coming back in this scenario is to remove the nails or screws and replace them with new stainless steel or galvanized screws. This is not an easy option as it may cause damage to your deck boards as you try to remove the rusting nails/screws.

How To Brighten A Deck Video – DeckStainHelp.com

If you have any questions about fixing black rusting nails on your deck, please ask below.

Please post a picture or two as well!

Please Rate This. You may also post comments or ask questions below.

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Ava
Ava
3 months ago

Why was my question and statement posted 9/7/2022 removed unanswered?

Ava
Ava
3 months ago

My original question / statement is back up below this reply. It was removed for awhile after I posted it. My question concerns having no black rust marks on my deck prior to or even during cleaning brightening process with Restore A Deck they showed up a few days later after rain stopped before I could stain. Deck is 14 months old and had no marks whatsoever before using that cleaner/brightener combination. The black rust marks are around all the deck screws and since they were not there before cleaning how could the cleaner not be the cause? Thank you

Last edited 3 months ago by Ava
Ava
Ava
3 months ago

I had zero marks around my 1 year old unstained pressure treated lumber deck until I used Restore A Deck cleaner and brightner. It rained for two days and when rain stopped today I see the black marks around the deck screws. This deck has been rained on and snowed on (Central New York even used ice melting products in winter on small section of deck) for 14 months and there were absolutely no marks around any of the deck screws, in fact, they were barely visible! How do you explain rust from using the wrong screws not showing up until I used Restore A Deck which you gave such a great review? Now I’m stuck with TWP semi transparent stain I can no longer use and will have to paint deck dark brown as trying to replace every screw in deck would be almost impossible and may damage boards.

Ava
Ava
3 months ago

I really appreciate your answer but had I not cleaned the deck I would have no black marks I believe I read they would continue to bleed through even if I brightened again? If I did same deal with letting entire deck dry for 48 hours and then use dark brown solid stain and that will fix ?

Ava
Ava
3 months ago

Thank you. None of this made sense to me until the OPW online store that sells TWP explained that during the cleaning process the friction from using a pressure washer or deck brush or sanding could strip the coating off the nail heads that were a bad batch or the wrong material and then they would subsequently rust. So I was correct in my assumption that the rusting was associated with the cleaning process – I used a deck brush – but I was incorrect in my assumption in was the cleaner that was the culprit. Just wanted to pass this on to your readers because it helped me to understand more. I appreciate your responses and the info on this site.

Ava
Ava
3 months ago

Wouldn’t the water rinsing the brightening agent just bleed out the rust again?

Ron Clark
Ron Clark
5 months ago

I have a large deck that was stained with Sherwin Williams solid deck stain. It is starting to peel, and I would like to remove the solid stain and re-stain. Does the deck stain/paint remover take most of the solid stain off? Also, I have 1 by cedar wrap, and railing support as well. Would it be good to pressure wash and seal for the lasting raw cedar look?

Thanks

Flo
Flo
5 months ago

HI!
I have black rust spot from nails on my redwood fence- the redwood is untreated (we live in So Cal and have very good weather). The fence is beautiful other than the eye sores: black streaks around all the nails (just like your pictures show). Is there a way I can spot treat to remove the stains, without having to then stain the entire fence?
I have tries TSP (made the TSP, bleach and water mix, as well as the TSP water mix) , hydrogen peroxide solution, dawn soap (that cleaned the fence but did nothing to the black marks), oxalic acid. But all those change the color of the wood, significantly.
I’d love some feedback, guidance and help.
We love the color of the fence and do not want to change it at all by staining it.
Thanks in advance

Flo
Flo
5 months ago

Thank you so much for the reply. Can I use the Wood Brightener to spot clean the rust spots?
Or would that change the color of the wood? In those spots
I am attaching pictures
Thank you in advance, if any of your products would work I would be thrilled

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Jack
Jack
5 months ago

Hello, first I’d like to thank you for this site. The best collection of information I’ve found. So I used pressure treated pine with bronze coated screws for a deck I built last summer. Most of the boards have cupped, so my plan was to flip them over, clean with oxiclean, brighten with oxalic acid and seal with Seal-Once clear. I tried this on a couple of boards, and it worked well, except after using oxalic acid to brighten the test boards, I got these black spots around the screw holes (screws had been removed). Any ideas of what caused them and how to get rid of them? Thanks again.

Debbie
Debbie
6 months ago

Why are my nails rusting and bleeding out black stains on our brand new pressure treated deck and what should I do to fix this before staining it so they won’t show through?

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Larry peglow
Larry peglow
7 months ago

My treated wood was built in 1991 and the old galvanized screws have the black rust stains. The deck is stained with a solid color deck stain. I would like to seal the rust stains and restrain with a solid color stain. I used the rust oleum rust sealer but it failed. Any suggestions beside Deck Brightener

Joyce Higgins
Joyce Higgins
1 year ago

I need to re-stain our textured no slip deck. Do I have to remove all the old paint before I re-texture it? And I’m getting conflicting reports on which textured stain is the most durable for both snow and sun extremes.

Joyce Higgins
Joyce Higgins
1 year ago

How???? I’ve already power washed it 2x and sanded 🤦🏼‍♀️🤦🏼‍♀️🥵

Michael
Michael
1 year ago

Will a good water seal like Thompson’s prevent the rust from oozing out again?

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