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Farmall & IHC Tractors Discussion Forum
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Preparation for painting of a rusty surface

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LenNH

04-28-2008 14:12:09




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Have a small tractor with fenders and pressed-steel disc wheels. There are rust spots on both, and I expect that there are pits under them.
I would appreciate any advice on preparation for repainting.
Rust removers? Naval jelly? Fillers? Sandblasting instead of rust removers? Sandblasting AND rust removers?

Don't have much experience with this kind of work, but I know a lot of you out there do.
Thanks for any advice.

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El Toro

04-29-2008 07:59:22




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 Re: Preparation for painting of a rusty surface in reply to LenNH, 04-28-2008 14:12:09  
The fenders may be too thin for sandblasting. Hal



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Haas

04-29-2008 02:29:20




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 Re: Preparation for painting of a rusty surface in reply to LenNH, 04-28-2008 14:12:09  
One post here says to use a wire wheel on an electric drill. Electric drill is too slow to do much with a wire wheel. Better to get a 4 inch angle grinder and a wire cup wheel for it. If you are not doing much, just get one of the cheap angle grinders from Northern Tool or Harbor Freight. If you are going to use it a lot, go for one of the name brands. Be sure you wear eye protection (face shield is best)when using angle grinder and make sure the cup wheel is rated for the RPM of the grinder which is usually about 12,000 RPM. Also, heavy leather gloves and long sleeves and pants are essential, as the wire brush is going to throw a wire now and then. I've been using a wire wheel like this for cleaning large parts for a long time. I use red primer. However, best is to sand blast, but you'll likley need to find a sandblast shop if you go that route.

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CNKS

04-29-2008 17:57:59




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 Re: Preparation for painting of a rusty surface in reply to Haas, 04-29-2008 02:29:20  
Actually, I use wire wheels on drills AND angle grinders mostly on cast -- sounded like he just wanted to get most of the rust off, so I did not go into much detail. If I have rust on the sheet metal, I almost always do, I use a fiber wheel on an electric drill (haven't seen one for a 12000 rpm angle grinder and wouldn't want to be there when it blew up). The wheel goes to bare metal and scratches the metal badly, necessitating the use of surfacer, which I use anyway, over epoxy primer, instead of the somewhat antiquated (and much cheaper) red primer. On cast, angle grinder is much better and faster (also beats me to death), but a drill is used in the hard to get to places -- better selection of brushes.

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CNKS

04-28-2008 17:27:21




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 Re: Preparation for painting of a rusty surface in reply to LenNH, 04-28-2008 14:12:09  
A quick way is to use a wire wheel on an electric drill, then use Must For Rust from Home Depot. It does not have to be washed off, but you can remove most of the residue with a scotchbrite pad, then use wax and grease remover, resulting in a clean surface. But I prefer sandblasting for heavier steel like you have. Then use the Must For Rust to prevent rusting if you aren't going to paint them right away; keep them dry. Skip that if you are painting soon after. That is the quick way. The pits will be visible through the paint, the paint will actually highlight them. You really should fill the pits with body filler (that is a generic name, there are many similar products) sand smooth, use epoxy primer, then a sandable surfacer. A lot more work, but the pits will be invisible.

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ScottyHOMEy

04-28-2008 15:13:29




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 Re: Preparation for painting of a rusty surface in reply to LenNH, 04-28-2008 14:12:09  
For spots like that, I clean it up as well as I can with a wire brush or wheel, then treat it with a dilute phosphoric acid solution. It's pretty readily available at places like Lowes or HD. Brand names for it that I know are Ospho and Jasco. Either one will convert any little bits of rust as well as your surface to a gray or black iron phosphate (kinda like the concept of bluing on a gun barrel) that is much more stable than iron oxide.

If you put it on and keep it wet with the stuff for about a half-hour or a little more then rinse WELL with water, it will leave you with a surface ready for primer and paint.

Just be sure to cover anything like a concrete floor under where you're working.

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Mike L

04-28-2008 14:45:41




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 Re: Preparation for painting of a rusty surface in reply to LenNH, 04-28-2008 14:12:09  
Sand blasting will be fine for the wheels
but it may warp (Distort) the fenders the best thing is to have them diped. there is a place in Evansville In. called Ready Strip. They put it into acid that eats the paint and rust off when you get it back all you do is prime and paint.
There may be someplace like that close to where you live.



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