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Iron Stain Treatment

Oxcon (oxalic acid concentrate) is the only effective treatment for rust stains from around nails, spikes, and screws.

Oxcon comes as a concentrate that is diluted with water prior to use. It is best applied using a garden type pump-up sprayer but a brush or broom will also work. Apply a liberal amount to the wood, let it work on the surface for 10 to 15 minutes and rinse it thoroughly with clean water.

Oxcon should not be used for spot cleaning since it may cause blotching of the surface.

Made in U.S.A. Made in U.S.A.

Sizes & Prices

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5 Gallon 1 Gallon Sample
$125.40 $35.79 Free
oxcon5gal200x200 oxcon1gal200x200 oxconsample200x200


Shelf Life

  • 1 Year

Application Temperature

  • 40° to 90°

Application Methods

  • Garden pump sprayer

Surface Preparation

  • Clean and mold free


  • As needed
Special Instructions
  • Apply from bottom-up, rinse from top-down
  • Do not allow to freeze
  • Rinse thoroughly and completely
Coverage Rate
  • 1000 - 2000 square feet / gallon


Coverage Rate

1000 - 2000 square feet / gallon


five starL Bradley in WI (6/4/15) - "I had some rust stains around the nails on my home. I called Permachink and they had me try Oxcon. It worked great at getting rid of the rust stains. Thanks Permachink."

five star J Cornell in AZ (4/15/15) – "My name is Justin and I inherited an old hunting cabin of my dad’s after he passed. It was in terrible shape and nothing I tried was getting the black streaks from the nail heads to come off. I called and spoke with the gal at Perma-Chink and she suggested I clean it with Log Wash and if that didn’t get all the streaks off to clean it with the Oxcon. Man-oh-man was the Oxcon the difference maker. This stuff worked so well, the cabin looked like it did when I was a little boy. Thank you for helping me preserve my dad’s hunting cabin for me and my boys!"

five star H Stands in CO (2/5/13) – "I am a log home owner in Aspen, Colorado where I recently ran into an issue of dark streaks on my log home. I was frustrated with what could be causing these dark streaks and decided to call Perma-Chink and talk to a customer sales person about the issue. After discussing my problem I sent pictures to Perma-Chink where they soon discovered that these streaks were from metal tannates that were left from a sanding tool, the salesman suggested that I use the product Oxcon, and I did. The Oxcon removed all the black streaking on my home perfectly, I am relieved that it was easily fixed. I am now a believer in this product and Perma-Chink has earned my trust!"

five star S Cothern in MN (5/14/12) – "I’ve been in the log home maintenance business for 25 years. My experience with Oxcon is, without a doubt, the best product on the market to remove metallic stains. It’s very effective and reasonably priced."

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