Rust conversion

[Rovcketman357]

Anybody have great experience with a rust conversion product?
Just bought a machine that spent a lot of time outside and it has some heavy rust on the cab and the attachments. Plan to wire brush and then treat with a conversion product before painting.

 

[Mike1955]

Wire brush is mighty abrasive. Someone hopefully has another suggestion

 

[Eagle1]

Rust conversion products need some rust to work, nothing done with good metal. Rust killers, etc can work by covering and treating.
I like Ospho for rust converter, thin to get into tight places and high rate of conversion. Seems like you get a nice hard product after it is done and dry. It does take longer to dry than others but I think it helps it work. Others may not see it that way.

 

[Topzide]

Black Star rust converters. Haven't used this product with great success and doesn't require a topcoat and just a pressure wash to knock off the dirt.

www.mrochem.com

$90 a gal and is just thicker than water and can be brushed, rolled or through airless sprayer (garden sprayer).

 

[KennyG]

As far as a rust converter, Ospho seems to work very well and is not expensive. I've never understood the advantage of paying more for a rust converter. It kind of depends on what kind of finish you want. If it's just surface rust and you want a smooth finish, you might want to touch it with a fine flap disc and then prime with a build up primer.

Note that Ospho recommends using it on clean metal also. I've ground the rust off things and then hit it with Ospho followed by a conventional primer and it's worked well.

 

[Mtsoxfan]

I've been using rustoleum rust converter, in a spray can for my truck. never liked Fluid Film and the like, drippy drippy, etc. 2 $6 cans do my whole frame and other spot rust. For me, it works well. Very little rust comes back. All I had was surface rust on all the welds on frame though. Truck is only 7 years old and driven in the winter.

 

[HawkinsHollow]

Ospho is phosphoric acid so it converts the iron in the steel to Iron Phosphate before the iron oxide(rust) can't take hold. In the case of already rusted metal it converts the iron oxide (rust) to FePO4. Obviously it works best when you remove as much of the loose rust as you can by mechanical means. Somone commented it takes longer to dry, it has wetting agents that slows the dry time for greater conversion. Once it is dry the conversion process ends. I have used it with great success.