Help - Fixing rust spots on the inside of a grain bin

andy r · Sep 8, 2016

I moved a grain bin Monday and sat it up on the foundation today. Before I start adding the remaining five rings I want to properly seal up / paint in a couple spots where it appears the grain has been wet and damaged the galvanization. Looked to me like the previous owner had put some wet soybeans with a bunch of green pods in the bin. Took the pressure washer and cleaned up the inside of the bin sheets this afternoon. Pressure washing left the surface fairly smooth. All of the residue has pretty much been cleaned off. The galvanization has been "eaten" away in some spots leaving rust spots the size of half dollars. Thought I would make the repairs as the bin goes up in the air. How would you go about fixing these rusted spots?????? Some of my thoughts are: 1) Maybe rub a little of that green phosphoric acid metal prep on the rust spots to neutralize the rust. 2) Dab some rust neutralizing primer on the spots. 3) Maybe spray with some "cold" galvanizing (compound) - spray on the dried primer. That is about all I can think of. Any ideas???

bcdave · Sep 9, 2016

There is a product called Rust Converter that chemically changes the rust and turns it black. It can be painted over. I have used it on rusty tools
Dave

JD Seller · Sep 9, 2016

You can buy PRO-15 in silver now. I have been using it to cover those type of areas in my bins.

Bob Bancroft · Sep 9, 2016

I think JD means POR.

4520BW · Sep 9, 2016

I have used Rust Kutter from TSC. Spray it on and wait a day and then prime the area. Sounds similar to the stuff bcdave uses.

moresmoke · Sep 9, 2016

Cold galvanize needs to go on bare "white" steel to work properly. You would need to spot blast it to be done right. For that application, I would probably use one of the products that turns the rust black.

Ellis Kinney · Sep 9, 2016

I would smear it with a two part epoxy. Ellis

flying belgian · Sep 9, 2016

I just took the wire brush to it then brushed on an oil based primer. Five years, so far so good.

Help - Fixing rust spots on the inside of a grain bin

andy r

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bcdave

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JD Seller

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Bob Bancroft

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4520BW

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moresmoke

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Ellis Kinney

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flying belgian

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