Stubborn stubborn rust

Markgkda

Markgkda

New member
Here are a couple pics of rust that I can't seem to remove. There was a lot of staining some lighter in density that I did get clean but these were heavier and I’m stumped. This is new concrete within the last 4 months and it appears that some nimrod parked a roll off dumpster there for awhile. I treated with undiluted F-9, dwelling for 10 mins or better 3 different applications. Then I also tried one restore full strength, dwelled 10-15 mins. I don't think any more dwell time would have changed the outcome as there wasn't even the slightest affect in the time that it did set, and I would think I would have had at least some progress.

Any ideas?


rust1.jpgrust2.JPG
 
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Markgkda said:
Here are a couple pics of rust that I can't seem to remove. There was a lot of staining some lighter in density that I did get clean but these were heavier and I’m stumped. This is new concrete within the last 4 months and it appears that some nimrod parked a roll off dumpster there for awhile. I treated with undiluted F-9, dwelling for 10 mins or better 3 different applications. Then I also tried one restore full strength, dwelled 10-15 mins. I don't think any more dwell time would have changed the outcome as there wasn't even the slightest affect in the time that it did set, and I would think I would have had at least some progress.

Any ideas?


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If you don't get the results with F9 you are hoping for it's one of 3 things:

Dilution
Application
Process

In your case I think it's a combination of all 3. Rust removal like what you have there is like baking a cake. If you don't have one of the ingredients or use things in the wrong order you won't get results.

I'd suggest to watch all the videos under F9 University, especially this one: How to remove battery stains on a driveway http://www.youtube.com/watch?v=mjPTlMqyZHE

Call me after if you have questions


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Markgkda said:
Here are a couple pics of rust that I can't seem to remove. There was a lot of staining some lighter in density that I did get clean but these were heavier and I’m stumped. This is new concrete within the last 4 months and it appears that some nimrod parked a roll off dumpster there for awhile. I treated with undiluted F-9, dwelling for 10 mins or better 3 different applications. Then I also tried one restore full strength, dwelled 10-15 mins. I don't think any more dwell time would have changed the outcome as there wasn't even the slightest affect in the time that it did set, and I would think I would have had at least some progress.

Any ideas?


View attachment 28746View attachment 28747
Click to expand...

Is that concrete sealed?


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Its really new , less than a month or so. I have asked the owner if it had been and he hasn't gotten back to me. With the way some oils from cars have already penetrated and how deep, I would guess that it wasn't or at best the owner paid for sealing but got an inexpensive product put down? Thats pretty typical.
 
Thanks Craig. I did clean the surface first, then applied F-9 letting it dwell for 15 min or better three times. I did use it full strength only because I assumed that with the extreme heavy deposits it was necessary. I reapplied and let dwell two more time and still didn't have much luck. There were a lot of light rust stains that did come out nicely but these are an issue for sure. In the past I have been amazed at what F-9 does. I watch the rust disappear and have been doing this type of work a long time. Always used safe restore in the past but purchased F-9 and have been pleased. This stuff just laughed t F-9 and safe restore. Maybe its form a UFO landing? LOL . I may try and give you a call, any certain time of day better?
 
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