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Antique Tractor Paint and Bodywork

painting over rust

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Wideload

09-20-2006 19:41:24

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I'm about to paint the transmission and rear end of a Case tractor. There is no loose rust have wired brushed and sanded. The original paint was gone and it rusted so now it has a rust colored finish. What do you recommend I paint it with as a primer before I apply the finish coat. Thank you.

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Yooper

09-29-2006 16:58:27

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Re: painting over rust in reply to Wideload, 09-20-2006 19:41:24

Eastwood rust encapsulator or POR 15 in that order. Eastwoods is more forgiving as to when you topcoat.

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IH2444

09-26-2006 18:40:47

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Re: painting over rust in reply to Wideload, 09-20-2006 19:41:24

I have had excellent results using Rustoleum rusty metal primer. It is oil based and might not work with some topcoats, but works fine for me.
Ben

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PaulW_NJ

09-23-2006 16:52:03

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Re: painting over rust in reply to Wideload, 09-20-2006 19:41:24

After stripping paint from cast via oven cleaner or lye gravy, I apply Picklex20. It is a phosphoric acid based pickling agent. It prevents surface rust prior to priming pretty much indefinitely. After that, epoxy primer does an excellent job of sealing the surface prior to topcoating. Have also had good success using ZeroRust on "back surfaces" that will not be topcoated but have no experience applying 2K urethane topcoat over ZeroRust. May work fine.

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CNKS

09-23-2006 17:34:44

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Re: painting over rust in reply to PaulW_NJ, 09-23-2006 16:52:03

I am seeing some paint defects on a tractor I put Picklex on 4 years ago. Could be many things, but I am not going to use Picklex on cast anymore. Acid cannot be washed off, it must be neutralized -- hard to do on pourous cast.

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PaulW_NJ

09-24-2006 04:53:00

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Re: painting over rust in reply to CNKS, 09-23-2006 17:34:44

CNKS

Wow, that"s scary news! I recall flash rust developing on my Cub minutes after I power washed off the oven cleaner residue. Flash rust appeared as it dried! I wiped it down with Picklex and let it dry before priming. How would you handle cast now between cleaning and priming? Would you prime right over the flash rust?

I was planning to paint the rear of my 340 soon, but since I"m not chemically stripping but rather "wire-wheeling" it, flash rust is not so much of an issue. But I had planned on Picklex first . . . now I will not! But every other part I"ve taken off the rear is sitting on a couple workbenches with a Picklex coating. Obviously I"m concerned!

Also, do you use Picklex after sandblasting on non-cast? - was thinking of getting my rear rims and inserts blasted next week.

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CNKS

09-24-2006 07:41:45

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Re: painting over rust in reply to PaulW_NJ, 09-24-2006 04:53:00

I am fortunate that I live in a dry climate. I avoid flash rust by immediately drying the parts or chassis with towels. Any flash rust that develops is removed by wire brushing. Contrary to most on this forum, I can leave bare metal for months inside with no problems, however I do sand it before painting. I am not sure the problem with the 4 year old paint was caused by Picklex. However, etch primer is not recommended for cast, either, I do not know the type or concentration of the acid in etch. Picklex is a zinc/phosphoric acid combination, I believe 20% acid, thus the the name Picklex 20. That is a LOT. Picklex was recommended to me 4-5 years ago by a long-time automotive painter in Penn. However he had never used it on cast. I sometimes do use Picklex as a protectant on non-cast parts. But, mostly I use it as a rust neutralizer on areas that I simply do not want to sandblast and where it is next to impossible to get it off with a wire brush.

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souNdguy

09-21-2006 06:21:07

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Re: painting over rust in reply to Wideload, 09-20-2006 19:41:24

I've had pretty decent luck with using an etching primer of parts that were clean.. but had a nice brownish patina.. etc.

Soundguy

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Steve-Maine

09-21-2006 03:41:46

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Re: painting over rust in reply to Wideload, 09-20-2006 19:41:24

I have used POR worked great but quite expensive

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Mike S 806/H

09-20-2006 20:20:17

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Re: painting over rust in reply to Wideload, 09-20-2006 19:41:24

I purchased a quart of a paint called zero-rust the guys at the paint shop say its very good stuff I havent tried it yet, its kinda like chassis saver but has no isocyanates, I have also used John Deere buff yellow primer on a tractor with the same kind of rust as yours, I would spray over cleaner on it let it soak for awhile then powerwash it, some guys on here wont like what I said but it worked for me its been on there for 5 years now and looks great.

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