I?ve got a rear tractor tire that had fluid in it which was causing it to rust. I had the tire removed and found the metal surface under the tire was rusted and badly scaled. I spent a day grinding off the corrosion/rust. It was one of the dirtiest jobs I?ve done. Because of pitting I was never able to get a perfect bare metal surface but it was much better. I then put a heavy coat of rustoleum rusty metal primer on it. I checked it the next day and found little rusty water beads on it that appeared to be coming through the primer. I then put it in direct sunlight for several hours and then put another coat of primer on. Once the paint dried I found more water beads on it. Any ideas why I?m getting water beads and how I can get rid of the moisture?
 
chloride not water,

Now that the chloride has rusted the rim the metal is now porous like a sponge and it will keep leaching out of the steel. if you paint a product on the metal that doesn't allow it to surface the chloride will eventually eat through the steel in the opposite direction .

when I have rim with chloride damage I sand blast it let it sit out in the sun and let it rust again ,(and it will quickly) sand blast it again and let it sit and it will likely rust up again , usually by the third sand blasting it will all be worked out of it.

that is the only sure way that I know of to stop the rusting .
 
You needed to wash those rim down real well with water then let dry and wash them again. When I do rims I grind/chip them off wash them down good and then use pickup truck bed liner spray on them
 

Yes it is a very nasty job. You are not seeing water bleeding out, what you are seeing is the moisture that is in the air that is being drawn to the rust that is still left here and there. (Rust produces positively charged ferric ions which draw negatively charged hydroxyl ions in water.). I have had this happen to me before. I did a rim last week that I had a flat with some ten years ago in the manure lagoon. I didn't stop to clean it out good at the time and of course I forgot all about it so next time it had a problem it was very bad. What did you use for a disc on you grinder? You need to use an aggressive flap wheel due to the curvature of rim. Follow the flap wheel with a phosphoric acid rust converter in order to get down into the pits. We have very high humidity here right now and I had no water drops coming out over the next two days.
 
muriatic acid will take the rust off and leave clean shiny steel but it needs to be rinsed off and painted real quick because it will flash rust again . don't breath it and use a hand sprayer to apply wear rubber gloves also.
 
Tough to beat sandblasting.
I rehabbed some rims and centers on a Ford this spring. They had CaCl in them and had quite a bit of rust. I spent a good hour+ on each rim with a needle scaler then off they went to the sandblaster.
I had to do a bit of brazing on one of them then brushed on Rustoleum primer then brushed on 2 coats of tractor/implement enamel.
Not as good as new but should last a long time.
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Sandblasting is good, it depends on a lot of things. The wheel that I did last week was a front and the amount of time that it takes to set my pot up and to do the job was not available then. I was able to do a good job with the aggressive flap wheel. Anything that I have had blasted still has rust on it. Little black spots. They are rust. They need to be killed or they are going to grow and come right out through the paint or bed-liner or whatever you use. I was picking up supplies to paint the body of my dump truck. I was going to blast it because it had areas of severe pitting where the loose paint had held moisture in. The counter guy told me that I needed acid wash. WHAT!!! I had never heard of it. Ever since I have used phosphoric acid wash. It turns the residual rust to the same black coating as is on sheet rock screws and many other fasteners. You can see plenty of residual rust on UD's rim. Convert it to iron phosphate and be done with it.
 
You can't beat sand blasting on a rusty rim.

I had to have one of the rear ones done on my D19 several years ago. I primed it and put two coats of silver paint on it. I'll do the other one if I ever have to take the tire off.
 

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