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Old 07-26-2014, 02:37 PM
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rust remover

Hi All. I'm in the process of dechroming my bumpers. The inside has some rust I can't get at with a grinder or any power tool to speak of. I'm sure you Guy's have a solution. I was thinking maybe Muratic acid.

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Old 07-26-2014, 02:43 PM
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Don't use Muriatc acid for metal, use Ospho (or other phosphoric acid for metal) if media blasting is not an option. If you are going to rechrome the bumpers, no need to do anything other than take them to the chrome shop
https://www.hotrodders.com/forum/osph...al-175465.html

Kelly
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Old 07-26-2014, 03:17 PM
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Thanks, I just did a quick search of rust removal and found out muriatic acid is not the way to go. I'm not going chrome because I'm on a tight budget. I plan to paint it for a aluminum look because it's a race car clone wannabe Max Wedge.

Last edited by 62440; 07-26-2014 at 03:43 PM.
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Old 07-26-2014, 04:24 PM
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Thanks to Eric over at "BigBlockDarts" here's a bit of info about EVAPO-Rust rust remover. All I have to do now is find some locally.
Evapo-rust rust remover

EVAPO-RUST is an amazing award winning rust REMOVER which is utilized by the U.S. Army, U.S. Navy, U.S. Air Force, FBI, NATO, Government Contractors, Engine Builders, Auto Enthusiasts, Gunsmiths, Forensic Labs, OEM’s, Farmers, Antique Restorers and more.
EVAPO-RUST is non-corrosive to steel and does not harm brass, copper, aluminum, gold, lead, titanium, steel, cast iron, chrome, solder points, vinyl, plastic, rubber, silicone, glass, cork, or wood. EVAPO-RUST has an indefinite shelf life* and can be used over and over until it absolutely stops working. On average, one gallon de-rusts up to 300 pounds of light to moderately rusted steel.


Evapo-rust is easy to use

EVAPO-RUST is easy to use. Fully immerse the rusted item in EVAPO-RUST and check progress in about 30 minutes; no scrubbing necessary. Soak times will vary from 30 minutes to 24 hours depending on severity of rust, type of steel, and temperature. EVAPO-RUST is water based, therefore the active molecules will slow down as temperature decreases and increase as temperature increases. We recommend utilizing EVAPO-RUST at a bath temperature above 60° F.
EVAPO-RUST has a surfactant to aid in penetrating oils and dirt. However, surface contaminants do slow the process and can shorten the life of EVAPO-RUST . Oils, greases and cosmoline should be removed prior to de-rusting. Cleaning the part prior to soaking in EVAPO-RUST will also help in the disposal of the spent product.

YES, EVEN MOTORCYCLE GAS TANKS
You can use Evapo-Rust to remove the rust from a gas tank in one of two ways described below, depending on if your tank is still attached or has been removed:

1) Completely fill the tank with Evapo-Rust and allow to sit for 2 – 4 hours. Drain completely and rinse well with water. Air dry and fill with gasoline immediately to eliminate flash rust.

2) Pour in 1 gallon of Evapo-Rust and rotate gas tank every hour until the rust has been removed. Drain completely and rinse well with water. Air dry and fill with gasoline immediately to eliminate flash rust.
-----------------------
NOTE: Althought Evapo-rust rust remover is designed to be a soak, it can be utilized in certain situations as a spray. Click here to view how a chassis was de-rusted using Evapo-Rust as a spray to de-rust a chassis.
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Old 07-27-2014, 01:01 AM
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This is what I do...

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Old 07-27-2014, 01:36 PM
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Just to give you some input on painting the bumpers. You don't have to remove all of the chrome for paint. I have been painting chromed bumpers for years with zero problems using this method.
1) Use wax and grease removing to clean the bumpers.
2) Hit the chrome with an 80 grit disc on a 3M soft pad in your D/A.
3) Spray a wet coat of Dupont Vari-Prime self-etching primer.
4) Epoxy prime, two wet coats
5) Block sand for smoothing or do body work if necessary.
6) Re-prime as necessary
7) Finish for top coat.
I have never had a peeling issue after painting a bumper this way.
Mark
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Old 07-27-2014, 11:04 PM
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Quote:
Originally Posted by astroracer View Post
Just to give you some input on painting the bumpers. You don't have to remove all of the chrome for paint. I have been painting chromed bumpers for years with zero problems using this method.
1) Use wax and grease removing to clean the bumpers.
2) Hit the chrome with an 80 grit disc on a 3M soft pad in your D/A.
3) Spray a wet coat of Dupont Vari-Prime self-etching primer.
4) Epoxy prime, two wet coats
5) Block sand for smoothing or do body work if necessary.
6) Re-prime as necessary
7) Finish for top coat.
I have never had a peeling issue after painting a bumper this way.
Mark
There's really no point for the self-etching primer if you're doing it this way. Save yourself some money and a step...
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Old 07-28-2014, 04:37 AM
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Quote:
Originally Posted by Lizer View Post
There's really no point for the self-etching primer if you're doing it this way. Save yourself some money and a step...
Yea, there is a point... I don't remove the chrome. Just roughing it up with the 80 grit. Try this without the etching primer and the paint will peel within a year.
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Old 07-29-2014, 12:14 PM
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Quote:
Originally Posted by astroracer View Post
Yea, there is a point... I don't remove the chrome. Just roughing it up with the 80 grit. Try this without the etching primer and the paint will peel within a year.

Yeah it doesn't make sense to me because etching primer should only etch bare metal, and roughing something up with 80 grit should be more than enough adhesion for epoxy.


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Old 09-12-2014, 01:47 AM
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Use citric Acid Solution to remove rust it will do an amazing job very little cost and made from citrus.
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Old 09-12-2014, 07:48 AM
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electrolisis

Rust removal by electrolysis
we have used 5 gallon buckets like shown, a 55gallon plastic barrel and my son lined the pickup bed with 6 mil plastic, and bent and welded a rebar cage. You don't use this process for critical suspension or high stressed parts. on badly rusted parts you will have to pull out the rebar a couple times and knock off the krud so it will work faster
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Old 09-14-2014, 05:58 AM
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There you go. I love this method and the P/U bed is a great idea for a big tank...
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