Re: Best brushable rust treatment for mild surface rust.
[Re: migsBIG]
#2868701
01/03/21 11:35 PM
01/03/21 11:35 PM
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Joined: Jan 2003
Posts: 1,376 NORTHERN CA
HUSTLESTUFF
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,376
NORTHERN CA
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I've used Rust-Mort for some things. It's not a Por-15 type product just a thin liquid you could even spray.
"Were in it to win it. Anything less will end up being..... A whole lot of fun doing!!" UNLAWFL RIP UN
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Re: Best brushable rust treatment for mild surface rust.
[Re: ek3]
#2869546
01/05/21 11:47 PM
01/05/21 11:47 PM
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Joined: Jul 2003
Posts: 3,267 Connecticut
1972CudaV21
master
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master
Joined: Jul 2003
Posts: 3,267
Connecticut
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Sells for about $90.00 a gallon.
China is the enemy.
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Re: Best brushable rust treatment for mild surface rust.
[Re: 1972CudaV21]
#2869570
01/06/21 02:45 AM
01/06/21 02:45 AM
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Joined: Mar 2011
Posts: 1,653 Cut and Shoot, TX
kentj340
top fuel
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top fuel
Joined: Mar 2011
Posts: 1,653
Cut and Shoot, TX
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For mild surface rust, simply apply by brush or spray bottle some form of phosphoric acid. Let it dry, and spray with rattle can primer or paint. Problem solved. You could also just apply the acid and not paint it. Problem solved. The paint is just extra insurance in case the metal gets wet in the future, which could happen from condensation. Of course, it's better to physically remove rust residues with sanding or wire brushing before applying the acid, but if this isn't done, the acid will still do a good job of killing the rust, especially mild surface rust. If brushing it on, use a nylon bristle brush or the bristles will be consumed. The reason it is better to physically remove the rust first is that the acid strength is depleted faster when rust residue is present. If the residues are not physically removed, apply additional coats of acid. Where the residue is well removed, usually only one coat of acid is needed. Search You Tube with "removing rust with phosphoric acid " for several videos. Many restoration shops and many collision shops use some form of phosphoric acid on all bare metal before primer, and most automotive paint stores sell it. It is a well known and common treatment in industrial applications for metal before primer, sometimes called "bonderizing". Rust Mort contains 40-60% phosphoric acid according to their safety data sheet. Other common brand names for phosphoric acid are Ospho, Rust Cure, and Gem Rust Killer, available here. Some retailers may have Gem in smaller containers than 1 gallon. I've been using Rust Cure phosphoric acid for many decades, including today. For unseen areas like the underside of a car roof, I would apply the acid and allow it to dry. For visible areas, the acid should not be allowed to dry, as it will leave a crusty film. In this case, I allow the acid 15-30 minutes to do its job, wipe off with a rag, brush on paint thinner, wipe off, then paint after the thinner has dried. Do not rinse with water - paint thinner is better. To remove the film after the acid has dried, re-wet with acid and rinse with thinner. Never apply phosphoric acid to any zinc plated item as it is very reactive with zinc and will ruin any zinc coating. Phosphoric acid will cause discoloration to painted surfaces or epoxy-coated shop floors. Phosphoric acid will ruin your clothes. Wear nitrile gloves. Once upon a time, after a plumber had used a metal snake in a commode, there were numerous, unsightly, dark metal markings on the bowl surface. I poured in some Rust Cure, and the bowl became spotless. Rust Cure, Gem, and other similar forms of phosphoric acid are typically green colored. Phosphoric acid is much safer to handle than hydrochloric, nitric, or sulfuric - getting it on your skin does pretty much nothing, but if it itches, just wash it off. Soft drinks contain phosphoric acid. But if applying with a spray bottle overhead, you certainly don't want to inhale it.
If you don't see two dolphins, you need a vacation.
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Re: Best brushable rust treatment for mild surface rust.
[Re: kentj340]
#2869601
01/06/21 09:42 AM
01/06/21 09:42 AM
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Joined: Jan 2003
Posts: 10,694 North Dakota
6PakBee
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,694
North Dakota
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It seems that every time this topic comes up, it breaks down into two main categories, rust encapsulators and rust converters. I'm not sure which is better but after reading numerous horror stories about POR-15 I lean towards the rust converters. But that is my opinion only.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: Best brushable rust treatment for mild surface rust.
[Re: 6PakBee]
#2869739
01/06/21 03:02 PM
01/06/21 03:02 PM
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Joined: Jan 2003
Posts: 5,664 South Dakota
hotairballoonpilot
master
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master
Joined: Jan 2003
Posts: 5,664
South Dakota
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I like SEM rust seal. You don't have to neutralize it after apply it like SEM Rust Mort. rust mort you need to wash it off with water to get any acid on the surface before applying anything on top of it. rust seal is good to go.
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Re: Best brushable rust treatment for mild surface rust.
[Re: hotairballoonpilot]
#2870025
01/06/21 07:42 PM
01/06/21 07:42 PM
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Joined: Jan 2003
Posts: 43,507 Round Lake Beach, Illinoisy
Rhinodart
Rhinotruck
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Rhinotruck
Joined: Jan 2003
Posts: 43,507
Round Lake Beach, Illinoisy
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I used Corroless from Eastwood on a 69 Dart survivor car that had surface rust in the trunk seams in 1992 and when I sold it there was no further rust and it remained exactly as I brushed it on 16 years later....
The funny thing about science is that if you change one miniscule parameter you change the entire outcome to the way you want it.
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A-Body's RULE!
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Re: Best brushable rust treatment for mild surface rust.
[Re: Rhinodart]
#2870042
01/06/21 08:17 PM
01/06/21 08:17 PM
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Joined: Jan 2003
Posts: 10,694 North Dakota
6PakBee
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,694
North Dakota
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I used Corroless from Eastwood on a 69 Dart survivor car that had surface rust in the trunk seams in 1992 and when I sold it there was no further rust and it remained exactly as I brushed it on 16 years later.... Apparently Eastwood doesn't offer Corroless any longer. From another forum "It's no longer called Corroless. They now call it Rust Encapsulator. It is a fish oil product & works great. Proven better than POR-15 on rust."
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: Best brushable rust treatment for mild surface rust.
[Re: ek3]
#2870166
01/06/21 11:18 PM
01/06/21 11:18 PM
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Joined: Jul 2003
Posts: 3,267 Connecticut
1972CudaV21
master
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master
Joined: Jul 2003
Posts: 3,267
Connecticut
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Sells for about $90.00 a gallon. yep.. 22.50 per ot.. cheaper than por and 5,000 times better . 1 coat 1 time and its awesome for this purpose Nice👍
China is the enemy.
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Re: Best brushable rust treatment for mild surface rust.
[Re: ek3]
#2871143
01/08/21 02:45 PM
01/08/21 02:45 PM
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Joined: Sep 2003
Posts: 19,305 north of coder
moparx
"Butt Crack Bob"
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"Butt Crack Bob"
Joined: Sep 2003
Posts: 19,305
north of coder
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Sells for about $90.00 a gallon. yep.. 22.50 per ot.. cheaper than por and 5,000 times better . 1 coat 1 time and its awesome for this purpose approximately how much would a guy need to coat a trunk floor ? would a quart do it ? TIA as always !
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Re: Best brushable rust treatment for mild surface rust.
[Re: kentj340]
#2872906
01/11/21 10:53 PM
01/11/21 10:53 PM
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Joined: Jun 2012
Posts: 1,899 MYRTLE BEACH SOUTH CAROLINA
ek3
top fuel
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top fuel
Joined: Jun 2012
Posts: 1,899
MYRTLE BEACH SOUTH CAROLINA
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For mild surface rust, simply apply by brush or spray bottle some form of phosphoric acid. Let it dry, and spray with rattle can primer or paint. Problem solved. You could also just apply the acid and not paint it. Problem solved. The paint is just extra insurance in case the metal gets wet in the future, which could happen from condensation. Of course, it's better to physically remove rust residues with sanding or wire brushing before applying the acid, but if this isn't done, the acid will still do a good job of killing the rust, especially mild surface rust. If brushing it on, use a nylon bristle brush or the bristles will be consumed. The reason it is better to physically remove the rust first is that the acid strength is depleted faster when rust residue is present. If the residues are not physically removed, apply additional coats of acid. Where the residue is well removed, usually only one coat of acid is needed. Search You Tube with "removing rust with phosphoric acid " for several videos. Many restoration shops and many collision shops use some form of phosphoric acid on all bare metal before primer, and most automotive paint stores sell it. It is a well known and common treatment in industrial applications for metal before primer, sometimes called "bonderizing". Rust Mort contains 40-60% phosphoric acid according to their safety data sheet. Other common brand names for phosphoric acid are Ospho, Rust Cure, and Gem Rust Killer, available here. Some retailers may have Gem in smaller containers than 1 gallon. I've been using Rust Cure phosphoric acid for many decades, including today. For unseen areas like the underside of a car roof, I would apply the acid and allow it to dry. For visible areas, the acid should not be allowed to dry, as it will leave a crusty film. In this case, I allow the acid 15-30 minutes to do its job, wipe off with a rag, brush on paint thinner, wipe off, then paint after the thinner has dried. Do not rinse with water - paint thinner is better. To remove the film after the acid has dried, re-wet with acid and rinse with thinner. Never apply phosphoric acid to any zinc plated item as it is very reactive with zinc and will ruin any zinc coating. Phosphoric acid will cause discoloration to painted surfaces or epoxy-coated shop floors. Phosphoric acid will ruin your clothes. Wear nitrile gloves. Once upon a time, after a plumber had used a metal snake in a commode, there were numerous, unsightly, dark metal markings on the bowl surface. I poured in some Rust Cure, and the bowl became spotless. Rust Cure, Gem, and other similar forms of phosphoric acid are typically green colored. Phosphoric acid is much safer to handle than hydrochloric, nitric, or sulfuric - getting it on your skin does pretty much nothing, but if it itches, just wash it off. But if applying with a spray bottle overhead, you certainly don't want to inhale it. this is all true.. just one thing ,phosporic acid converts iron oxide into iron Phosphate . be sure that any product used has a chromate additive in it for corrosion control.. .ospho has it...
Last edited by ek3; 01/11/21 10:54 PM.
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Re: Best brushable rust treatment for mild surface rust.
[Re: HUSTLESTUFF]
#2877319
01/20/21 03:04 PM
01/20/21 03:04 PM
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Joined: Jan 2003
Posts: 21,637 San Jose,CA
migsBIG
OP
YouTube is my go-to news source
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OP
YouTube is my go-to news source
Joined: Jan 2003
Posts: 21,637
San Jose,CA
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Re: Best brushable rust treatment for mild surface rust.
[Re: migsBIG]
#2879232
01/24/21 07:35 AM
01/24/21 07:35 AM
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Joined: Nov 2004
Posts: 7,274 s.w.fl
bonefish
master
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master
Joined: Nov 2004
Posts: 7,274
s.w.fl
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That not too bad of an idea, but the problem with the acid is it has to be applied overhead as this is the inside of the roof. Even with goggles, don't want that kind of stuff dripping on me. Second thing is I plan the leave the door panels on so i would probably want to avoid anything that might be a problem for clean up or damage the panels, though they will be covered. I used the OSPHO on my inside roof.i just dampened a sponge (NOT SOAKED ) and it worked great.
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