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Antique Tractor Paint and Bodywork

Chemical Stripping your tractor

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Jeff Goard

11-11-2007 17:39:13




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What do u guys think about doing this to a tractor's fenders, hood, etc...that u are about to restore??




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pbrawner

11-18-2007 08:40:59




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 Re: Chemical Stripping your tractor in reply to Rod (NH), 11-11-2007 17:39:13  
The comment about a burn off oven is partially true. The oven heats the objects to 800 to 850 degrees and at that temperature the organic portion of the paint burns. If the load in the oven contains parts that have very thick paint or paints with high solvent content then there will be a large flair up in temperature. The temperature can reach heights of 1400 degrees. Before that high temperature is reached the internal sprinkler system comes on and puts out the fire and lowers the temperature. Sometimes the chemistry of the the coating being removed can cause pitting of the metal parts during the cooling by the sprinkler system. For heavy parts of a tractor this method is safe; however, the grills, hoods, light gauge metal parts, can be warped.
There are also services that remove paint by immersion in chemical tanks.
Paint removal is followed by chemical rust removal. It is important that the rust removal is not performed by use of mineral acids.
It is also known that sand blasting can heat metal causing shrinkage and warping.
As with all services, one should investigate the company and seek references prior to having any parts cleaned. After receipt of references, check them.

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TGS

11-18-2007 23:34:50




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 Re: Chemical Stripping your tractor in reply to pbrawner, 11-18-2007 08:40:59  
It is correct excessive film builds and the presence of solvent in an uncured finish can result in extreme elevated oven temperatures. Manufactures of these ovens make it clear not to process wet parts or exceed the oven’s design capacity in terms of lbs of coating per batch of items to be processed.

Since the late 1980’s, thermal stripping methods became common to the finishing industry as alkaline strippers were inefficient for removing cross linked thermoset coatings such as electrodeposition primers, acrylic or polyester liquid topcoats, and or powder finishes.

On the other hand, a chelated caustic stripping bath will rip apart virtually any uncatalyzed air dry coating with relative ease dependant on solution strength, temperature, and immersion times.

Care should be taken with stripped parts to assure the surface has been neutralized prior to painting. A dilute phosphoric acid solution, pH range of 5.0 to 6.0 will provide optimum adhesion and prevent paint failure due to saponification. This also applies to thermally stripped parts.

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TGS

11-17-2007 21:05:37




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 Re: Chemical Stripping your tractor in reply to Jeff Goard, 11-11-2007 17:39:13  
Granted oven cleaner will remove most air dry alkyd finishes. Often AG OEM's applied alkyd melamine baking enamels to cold rolled steel sheet metal parts such as hoods, etc. These baking enamels are more resistant to caustic materials than conventional air dry finishes. Oven cleaner in this case may not work too effectively as a chemical stripper.

Alternatives to chemical stripping may be of interest here. Manufacturing companies often send paint conveyor fixtures/hooks and finish defective parts to job shops who provide thermal stripping services. Using a burn off oven, the item is heated under controlled conditions to 850 F causing the paint to thermally decompose without affecting the base metal's properties. Custom powder coating shops often have burn off ovens of their own.

A custom powder coater can remove the paint, chemically treat the metal (iron or zinc phosphating) and apply a powder coated epoxy primer that will in most cases out perform other options..... so long as cost isn't one of them.

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pbrawner

11-17-2007 04:34:13




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 Re: Using Oven Cleaner in reply to Ivory, 11-11-2007 17:39:13  
If you will wet a piece of news paper then cover the stipper and cover that with a plastic garbage bag then the stripper will not dry out as fast and you do not have to come back and rewet it. You can leave it over night and wash it all off the next day. Be careful about disposing of the old paint since it will probably be lead based.



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61-4010

11-14-2007 16:53:31




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 Re: Chemical Stripping your tractor in reply to Jeff Goard, 11-11-2007 17:39:13  
I've been restoring a JD 4010 and the sheet metal, rims and center cast were sent off to a chemical stripping company. The yellow parts on the tractor (cast center hubs, 2 rear rims, 2 front rims and some misc bolt, etc) cost $300 and I think well worth the cost. Once I got them back, all I had to do was clean them with a wax/degreaser, epoxy prime and shoot my final PPG Concept. The results are spectacular and I cannot wait for the fenders, hood, cowling and other sheet metal parts to be completed as well.

Now granted it wasn't cheap...but I didn't have the time nor patience to do this to the level of quality this company did it. And like I said...the results are nothing short of spectacular for me.

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Dick L

11-18-2007 13:53:52




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 Re: Chemical Stripping your tractor in reply to 61-4010, 11-14-2007 16:53:31  
And your suggestion to those of us that do not have 300 bucks in our budget to repaint our tractors is?



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Jeff Goard

11-14-2007 07:35:05




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 Using Oven Cleaner in reply to Jeff Goard, 11-11-2007 17:39:13  
who has done this and would recommend this??



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PaulW_NJ

11-16-2007 20:33:11




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 Re: Using Oven Cleaner in reply to Jeff Goard, 11-14-2007 07:35:05  
Oven cleaner works well, although a concoction called lye gravy is cheaper to make. If you search the archives there"s a recipie for it, but it"s basically lye mixed into a cornstarch/water solution which just keeps it from running off. If you have multiple layers of paint usually one layer comes off at a time and you have to reapply. Be careful . . . lye solution is what they use to dissolve meat tissue off of bones so it will do a real job on your skin and eyes!

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Dick L

11-15-2007 11:06:26




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 Re: Using Oven Cleaner in reply to Jeff Goard, 11-14-2007 07:35:05  
What I have found using oven cleaner to remove paint is to take an old spray bottle filled with water and when the oven cleaner starts to dry, dampen it with a small amount of water. It keeps it working as long as it is damp. It will even help if it drys over night and you dampen it the next morning.
I like to do it out in the drive and after testing to see if it had done what I want it to do, I take a high pressure washer to it.

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Jim James

11-14-2007 08:39:47




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 Re: Using Oven Cleaner in reply to Jeff Goard, 11-14-2007 07:35:05  
I use it all the time for a degresser. I would not want to use it on some painted surfaces buts works fine for most surfaces.



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jeff goard

11-14-2007 11:09:25




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 Re: Using Oven Cleaner in reply to Jim James, 11-14-2007 08:39:47  
So does oven cleaner remove paint? Does it do a good job of doing it??



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glennster

11-14-2007 13:24:37




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 Re: Using Oven Cleaner in reply to jeff goard, 11-14-2007 11:09:25  
yup oven cleaner will remove enamel paints. it was a good way to remove lettering on trucks too. it doesnt work as fast as a commercial stripper like aircraft stripper, but its a lot cheaper to use. apply it, let it soak a while , it will bubble up, then scrape off with a plastic bondo spreader. reapply as necessary.



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circus

11-13-2007 03:06:57




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 Re: Chemical Stripping your tractor in reply to Jeff Goard, 11-11-2007 17:39:13  
When using stripper don't use unvented heaters like kerosene etc. The fumes are nasty.



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glennster

11-12-2007 05:48:12




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 Re: Chemical Stripping your tractor in reply to Jeff Goard, 11-11-2007 17:39:13  
chemical stripping works good. it is messy, and the strippers are caustic. commercial strippers are pretty expensive. oven cleaner is a good substitute. after you are done, you need to clean the metal real good to get all the stripper off and neutralized otherwise it will come back to haunt you.



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Jeff Goard

11-12-2007 06:08:05




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 Re: Chemical Stripping your tractor in reply to glennster, 11-12-2007 05:48:12  
Does the oven cleaner, just get the grease and oils off or does it remove paint...just wondering??



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CNKS

11-12-2007 17:34:34




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 Re: Chemical Stripping your tractor in reply to Jeff Goard, 11-12-2007 06:08:05  
Oven cleaner will remove a lot of the paint. I use both oven cleaner and stripper. The oven cleaner may not get all the paint off of cast. I use stripper to get the residual. Wear a charcoal mask when using either. Oven cleaner will make you wear one, unless you want to cough the whole time. Stripper (methylene chloride) is toxic, doesn't smell too bad, it will burn your skin. Skin protection and a mask are requirements when using it.

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