Removing rust

[farmboy89]

What is the best chemical way to remove large areas of rust... such as the roof of a car.... I need some way to chemically remove a very large area of rust, that will still support a paint job afterwards

 

[crane550]

What is the best chemical way to remove large areas of rust... such as the roof of a car.... I need some way to chemically remove a very large area of rust, that will still support a paint job afterwards

I hear of rust converters, but I imagine these will only work on the surface. Your problem remains underneath. Your going to want to sand, grind, and scrape off any rust that you have until your at un affected metel. Else your going to just postpone your problem. I recommend a wire wheel or heavy duty sand blaster.

If there are any better chemical solutions I would love to know about it.

 

[Platonic Solid]

Any Phosphoric Acid based metal etching product.

 

[wild70stang]

I have heard of this stuff works, thought I have never used it.

Behr.com: Products - Concrete & Masonry Cleaner/Etcher No. 991-N

 

[65fastbackresto]

I used Metal Ready

made by POR15, they got a website.

 

[67rcks]

sandblasting or wire wheel until you see no rust in pores. I would not use anything chemical that promises "to react with rust" or similar. All the manufacturers recommend applying PE-based putties on clean metal to get the best adhesion (you will get to it later).

 

[Hack]

I would be very nervous about sandblasting or wire wheeling a large thin piece of sheet metal like a roof. It's really easy to warp metal with either method. Consider checking with a pro locally.

 

[Platonic Solid]

PPG sells Phosphoric Acid as Deruster P800-127 which is similar to Por15 Metal Ready.

 

[coogs]

Swimming pool acid cut with water. Rubber gloves and scotchbrite pad.
Finish with "Ajax" cleanser and water. Dry it good and coat with epoxy primer
like SPI's stuff.

 

[Platonic Solid]

Swimming pool acid cut with water. Rubber gloves and scotchbrite pad.
Finish with "Ajax" cleanser and water. Dry it good and coat with epoxy primer
like SPI's stuff.

Swimming pool acid ( A.K.A. Muriatic Acid, A.K.A Hydrochloric acid ) is quite effective, but it leaves a salt deposit (which the Ajax cleanser is probably/hopefully removing.)

Phosphoric Acid leaves a rust inhibiting zinc oxide coating

 

[Jester67]

Rust Converter - Eastwood Rust Treatment & Prevention Products

Works well

 

[Chudik]

You can use wire wheeling or sender …