Re: Evaporust on heavy rusty metal.
[Re: Dodge33]
#2052513
04/12/16 02:05 AM
04/12/16 02:05 AM
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Joined: Mar 2011
Posts: 1,661 Cut and Shoot, TX
kentj340
top fuel
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top fuel
Joined: Mar 2011
Posts: 1,661
Cut and Shoot, TX
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With Evapo-Rust, you can check progress each day. No need to check any sooner. Heavily rusted parts may take several days. Even mildly rusted parts often need more than one day, depending on the strength of the chemical.
I always attempt physical removal of rust before the first dip by at least wire brushing and washing with soap and water.
Each time I check, I remove the parts from the Evapo-Rust, wash in hot, soapy water, and dry. Then I again attempt to physically remove any remaining rust, which saves depleting the chemical and speeds up the process. Physical removal can be wire brushing, sand papering, scraping with brass, or sometimes picking at the crusty spots with sharp tools or files. Back into the Evapo-Rust another day if needed.
Occasionally on heavily rusted parts, the Evapo-Rust fails to remove or is too slow to remove some crusty spots. In these cases, I have had good results soaking the parts in vinegar, a very weak acid, for a day or so, which tends to "pop" the crust. I may also attempt popping the crust with a sharp tool, which does no damage to the part since, if there is crusty rust, the part is already pitted anyhow.
Once parts are free of rust, I have had zero luck preventing returning flash rust after a few weeks, even when immediately drying with a heat gun, washing off with solvent, and storing in a Ziploc bag. Maybe the humidity is higher here than where others have had success with this. What I do to stop later rusting is coat with phosphoric acid and immediately wipe off. Repeat a week later. All 4 restoration shops I have talked to are using phosphoric acid too for rust prevention, especially for hidden or hard to reach parts of bodies. Some examples of phosphoric acid are Rust Cure, Gem, Naval Jelly, and Ospho, but there are many others, usually greenish in color.
I would not use any phosphoric acid for heavy rust removal, since it is an acid, and it will attack the base metal slightly. Although phosphoric acids such as Rust Cure are strongly acidic, very low on the pH scale, contact with skin is benign. If any itching, simply wash off with soapy water, and the itching will be gone. BUT, where there are fingerprints on the metal, the phosphoric acid or even Evapo-Rust may be partly blocked. To prevent finger prints on the metal I always use rubber gloves when dealing with Evapo-Rust or phosphoric acid.
One result of coating a de-rusted part with phosphoric acid and wiping off immediately is that the part will be slightly darkened. But that's okay with me.
If you don't see two dolphins, you need a vacation.
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Re: Evaporust on heavy rusty metal.
[Re: Morty426]
#2052559
04/12/16 03:09 AM
04/12/16 03:09 AM
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Joined: Mar 2011
Posts: 1,661 Cut and Shoot, TX
kentj340
top fuel
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top fuel
Joined: Mar 2011
Posts: 1,661
Cut and Shoot, TX
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After using Evapo Rust thoroughly clean and dry the part. Then use lacquer thinner to clean the part. Then I used RPM to keep it from rusting Yes, correct for parts with a bare metal final finish, except I will still coat and wipe off phosphoric acid before waxing for extra insurance. But if you are going to paint the part, you can't wax it. You can paint over wiped off phosphoric acid. Treating metal with phosphoric acid (called Bonderizing) before painting is used extensively in the auto industry. This is another reason for no fingerprints allowed.
If you don't see two dolphins, you need a vacation.
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Re: Evaporust on heavy rusty metal.
[Re: kentj340]
#2052562
04/12/16 03:18 AM
04/12/16 03:18 AM
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Joined: Mar 2008
Posts: 9,550 Sacramento CA
Morty426
master
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master
Joined: Mar 2008
Posts: 9,550
Sacramento CA
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After using Evapo Rust thoroughly clean and dry the part. Then use lacquer thinner to clean the part. Then I used RPM to keep it from rusting Yes, correct for parts with a bare metal final finish, except I will still coat and wipe off phosphoric acid before waxing for extra insurance. But if you are going to paint the part, you can't wax it. You can paint over wiped off phosphoric acid. Treating metal with phosphoric acid (called Bonderizing) before painting is used extensively in the auto industry. This is another reason for no fingerprints allowed. Agree. I was speaking about bare metal parts. For painted parts, since I live in CA, I usually don't have to resort to Evaporust.
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Re: Evaporust on heavy rusty metal.
[Re: Dodge33]
#2052571
04/12/16 04:03 AM
04/12/16 04:03 AM
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Joined: Mar 2011
Posts: 1,661 Cut and Shoot, TX
kentj340
top fuel
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top fuel
Joined: Mar 2011
Posts: 1,661
Cut and Shoot, TX
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For large parts like doors, trunk lid, and fenders, I'm planning to abandon Evapo-Rust and use de-rusting by electrolysis in a child's wading pool. Plenty of YouTube videos on that.
After de-rusting, I'll coat and wipe off phosphoric acid. Hidden and hard to reach places don't have to be wiped off, but any exposed or painted area needs wiping because the phosphoric acid will leave a too thick coating. An un-wiped coating can be re-dissolved by a new, fresh coating, then wiped.
If you don't see two dolphins, you need a vacation.
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Re: Evaporust on heavy rusty metal.
[Re: can.al]
#2052955
04/12/16 06:33 PM
04/12/16 06:33 PM
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Joined: Jan 2003
Posts: 75,282 A gulag near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,282
A gulag near you.
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I recently cleaned a very rusty 340 block. ..i did some experimenting and ended up mixing one part Evapo Rust with 8 parts water,completely submerged the block and left it for 6 days,Block came out completely rust free but needed a good cleaning with water to get the rust sludge off. it was rusted pretty badly and i did wire wheel the bores first How did you handle the water jacket cleaning ?
Mainstream Media is the new Pravda
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Re: Evaporust on heavy rusty metal.
[Re: Dodge33]
#2052970
04/12/16 07:01 PM
04/12/16 07:01 PM
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Joined: Oct 2005
Posts: 9,038 Ontario, Canada
Stanton
Don't question me!
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Don't question me!
Joined: Oct 2005
Posts: 9,038
Ontario, Canada
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For large parts like doors, trunk lid, and fenders, I'm planning to abandon Evapo-Rust and use de-rusting by electrolysis in a child's wading pool. Plenty of YouTube videos on that. So how are you planning to remove all the paint, undercaoting/sound deadener first ????
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Re: Evaporust on heavy rusty metal.
[Re: kentj340]
#2053005
04/12/16 07:50 PM
04/12/16 07:50 PM
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Joined: Jun 2012
Posts: 1,902 MYRTLE BEACH SOUTH CAROLINA
ek3
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Joined: Jun 2012
Posts: 1,902
MYRTLE BEACH SOUTH CAROLINA
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After using Evapo Rust thoroughly clean and dry the part. Then use lacquer thinner to clean the part. Then I used RPM to keep it from rusting Yes, correct for parts with a bare metal final finish, except I will still coat and wipe off phosphoric acid before waxing for extra insurance. But if you are going to paint the part, you can't wax it. You can paint over wiped off phosphoric acid. Treating metal with phosphoric acid (called Bonderizing) before painting is used extensively in the auto industry. This is another reason for no fingerprints allowed. To add a little more fun and /info on this ... phosphoric acid converts iron oxide to iron phosphate but it really does not provide any means of long term protection to the steel. chromates are added to products like ospho to "inhibit rust ".. and one old school use of phosphoric acid was to clean rusty cast iron frying pans ! old timers used a potato to wipe them out. potatoes are loaded with phosphoric acid !
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Re: Evaporust on heavy rusty metal.
[Re: Dodge33]
#2053014
04/12/16 08:00 PM
04/12/16 08:00 PM
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Joined: Oct 2005
Posts: 9,038 Ontario, Canada
Stanton
Don't question me!
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Don't question me!
Joined: Oct 2005
Posts: 9,038
Ontario, Canada
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and one old school use of phosphoric acid was to clean rusty cast iron frying pans ! old timers used a potato to wipe them out. potatoes are loaded with phosphoric acid ! And if anyone tells you you shouldn't clean a cast iron pan because it should be "seasoned", that's pure BS too! They didn't clean the grease out of iron pans in "the old days" because the pans travelled in the weather on the outside of the chuck wagon and the grease prevented rust. In this day and age, iron skillets should be washed after each and every use so the remains don't go rancid - which also wasn't an issue since the pan was used for every meal !!
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Re: Evaporust on heavy rusty metal.
[Re: Stanton]
#2053129
04/12/16 10:24 PM
04/12/16 10:24 PM
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Joined: Feb 2009
Posts: 1,274 Ontario.Canada
can.al
pro stock
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pro stock
Joined: Feb 2009
Posts: 1,274
Ontario.Canada
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and one old school use of phosphoric acid was to clean rusty cast iron frying pans ! old timers used a potato to wipe them out. potatoes are loaded with phosphoric acid ! And if anyone tells you you shouldn't clean a cast iron pan because it should be "seasoned", that's pure BS too! They didn't clean the grease out of iron pans in "the old days" because the pans travelled in the weather on the outside of the chuck wagon and the grease prevented rust. In this day and age, iron skillets should be washed after each and every use so the remains don't go rancid - which also wasn't an issue since the pan was used for every meal !! I would clean a cast pan but i would never soap it.Put a 1/4 inch of water in,raise the heat and it'll clean itself with a little scrape.
Last edited by can.al; 04/12/16 10:27 PM.
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Re: Evaporust on heavy rusty metal.
[Re: Stanton]
#2053278
04/13/16 12:31 AM
04/13/16 12:31 AM
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Joined: Jan 2011
Posts: 4,785 Utah and Alaska
astjp2
master
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master
Joined: Jan 2011
Posts: 4,785
Utah and Alaska
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Everything is better with BACON grease for seasoning. I imagine that you use soap in your coffee pot too... and one old school use of phosphoric acid was to clean rusty cast iron frying pans ! old timers used a potato to wipe them out. potatoes are loaded with phosphoric acid ! And if anyone tells you you shouldn't clean a cast iron pan because it should be "seasoned", that's pure BS too! They didn't clean the grease out of iron pans in "the old days" because the pans travelled in the weather on the outside of the chuck wagon and the grease prevented rust. In this day and age, iron skillets should be washed after each and every use so the remains don't go rancid - which also wasn't an issue since the pan was used for every meal !!
1941 Taylorcraft 1968 Charger 1994 Wrangler 1998 Wrangler 2008 Kia Rio 2017 Jetta
I didn't do 4 years and 9 months of Graduate School to be called Mister!
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