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Painting

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Duane H

12-30-2000 13:18:54




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I am restoring a Allis and need to know some info on painting. As with most old tractors, there is more surface rust than paint on the body. When I repaint, do I have to grind down to bare/shiny metal? Or is using a coarse wire brush on my angle grinder good enough. Any helpful hints would be appreciated.




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steve

01-01-2001 08:15:33




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 Re: Painting in reply to Duane H, 12-30-2000 13:18:54  
depends on the quality of paint job you expect. I have done a couple tractors and truck frames by using the wire brush. Get 90% of the stuff off. Wash off and wipe with a cleaner. I have then sprayed (or brushed) the red (brown) oxide primer that you buy for $20 a gallon at farm store, as a sealer over everthing. After it drys I switch to automotive enamel primer over the red oxide, sand it as needed and then a automotive primer top coal. This looks pretty good on a tractor or truck frame that use to be rusted. If you are talking about having a $700. paint job without minor flaws, then strip to the bare metal.

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BRIAN

12-31-2000 00:26:53




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 Re: Painting in reply to Duane H, 12-30-2000 13:18:54  
I OWN ASHOP THAT SPECIALIZES IN TRACTOR RESTORATION AND WHAT I PREFER IS TO USE 80 GRIT ON A 8"RANDOM ORBITAL SANDER AND STRIP TO BARE METAL THEN YOU WOULD FILL THA DENTS KNOW IF YOU HAVE ANY SANDING THE PUTTY WITH 80 GRIT USING A BLOCK OR STRAIGHT LINE SANDER THEN I WOULD GO OVER IT ALL WITH 180 GRIT SAND PAPER AND PRIME WITH A GOOD FILLING PRIMER THEN SAND PRIMER WITH 240 GRIT ON A BLOCK OR BY HAND PRIME IT AGAIN AND SAND WITH 240 1 MORE TIME TO REMOVE SCRATCHES THEN PRIME AGAIN AND WET SAND WITH 400 OR 600 GRIT SAND PAPER THEN PAINT IT OR SEAL IT AND PAINT IT EITHER WAY WILL WORK THE REASON I USE 80 GRIT INSTEAD OF 36 IS LESS SCRATCHES AND LESS CHANCE OF SWELLING WHEN YOU PAINT IT I DONT USSUALLY SAND BLAST SHEET METAL BUT WILL SAND BLAST CAST BUT GOING TO BARE METAL IS THE ONLY RIGHT WAY TO DO IT

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Hilltopper

12-30-2000 19:04:56




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 Re: Painting in reply to Duane H, 12-30-2000 13:18:54  
I work part time in a body shop mostly prepping the sheet metal. We have a 50 Ford truck completely down to parts now and it is rusted and pitted. On something this old it will be taken down to bare metal. We use 36 grit to take it down. Then use 180 grit. We then use Rust-Mort (phosphoric acid) and coat the metal. It will turn it dark overnight and convert the rust. Wash it off with wet rag or hose the next day. (if it is warm enough.) Light sand with 180 grit again. Any pits can now be filled with bondo. Spread it over the pits. Just before it gets real hard use a razor blade knife and slice it off. Block sand with 180. Do it again. Prime it with sealer primer. Wet sand with a block and again fill pits with bondo and block sand with water using 400 grit. When you think it is smooth enough prime the bondo, wet sand and paint. Good primer sealer is expensive. You can paint a car with it and it will not rust through for months if at all. Corvette panel adhesive (bondo) is very hard and tough but is expensive also. It will not pop up like regular bondo when you tap out a high place next to it. I would at least use the Rust-Mort (phosphoric acid) and a good primer sealer. Happy painting!:)

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Eldon in MN

12-30-2000 17:19:07




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 Re: Painting in reply to Duane H, 12-30-2000 13:18:54  
Remember if it is an old tractor it probably has lead based paint. I use a wire brush dunked in water to hold the dust down and wear a mask. Definitly keep kids away because toxins such as lead effect them quicker due to lower body mass.



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Alan Farley

12-30-2000 13:41:18




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 Re: Painting in reply to Duane H, 12-30-2000 13:18:54  
I wouldn't go all the way down to bare metal it makes it harder for the paint to stick. I have used a wire cup on a sidegrinder then used red oxide primer then two coats of AC persian orange and it looks fine. If you ask me red(or brown) primer is so much better than that grey junk. Good luck!



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get it sandblasted

12-30-2000 21:03:39




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 Re: Re: Painting in reply to Alan Farley, 12-30-2000 13:41:18  
find a good sandblasting service in your area and have it sandblasted,be sure to cover all the holes .sandblasting is the sure way to get a good paint job and will save you a ton of time on prep,the sandblasting should cost 200-250 but is money well spent.



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