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rust converted to primer?

2K views 10 replies 9 participants last post by  BondoKing 
#1 ·
Today I was walking around the auto section of walmart and I spotted something that seemed odd. I forgot the name of the stuff, but it was a small bottle of liquid that claimed it will turn rust into black primer that is sandable and paintable. This sounds like a gimmick to waste money on. Has anyone heard of this? And if so does it work?
 
#2 ·
i used something similar about 7 years ago on a small spot. now mind you , i didn't just put it right over rust. i cleaned the spot up as good as i could , there was just some pits that i couldn't get all the rust out of. but the spot that i used it on is still doing fine , no rust.
 
#5 ·
I wish it did work, the automotive repair industry could really use a product that performs like this is advertized. I did some work with it years ago but not impressed and haven't used it since. The stuff did turn black over rust, but suffered very poor adhesion on any unrusted metal, it washed off easily with laquer primer and didn't penetrate into the rust deep enough to convert anything other than the very top surface. Wasn't impressed, hell of an idea though.
 
#7 ·
A few years go I built a barn with drill pipe that was rusted pretty bad I wanted to test the same Wal-Mart stuff so I knocked the scale and loose rust off of 3 of the pipes and put the stuff on, I dod not clean it very well just knocked anything loose off. On the other pipe I sanded it as clean as I could but it still had some rust left in pits and pockets but it was a pretty decent job then I primed it with a paint over rust paint. 2 years later the 3 poles were still as good as new the last pole was flaking off the paint and rusted underneath the paint. So I would say it works very well, I have used it on a lot of stuff since.
 
#8 ·
There are a number of products that convert rust to a paintable coating. I use Ospho (phosphoric acid) on items that are rusty, I wire brush the loose stuff off and then take a sponge that is wet with Ospho and wipe it down. Let it sit overnight and then prime over it. On body work particularly with tractors I clean as much rust off that I can get then soak a sponge and wipe it down good to get into any small pits. They wipe down with a rig to just leave the surface damp. I have not had any problems with doing this, but would prefer to get as much rust off as possible.

Bobg
 
#9 ·
Well Well!

I've think Advance auto parts carries that evapo rust stuff. Well I don't have any holes from rust, just surface rust. I might give this stuff a try. But if it's just surface rust, then I'll just save the $5 that pays for that rust to primer stuff and sand it off. Then spray on some primer.
 
#10 ·
Used it once on a very pitted vintage peddle car. I applied as per directions urethane primer over it to surface the car smooth. Painted a beautiful candy paint job over it.

It TOTALLY failed with the primer coming off the "magic primer" in large sheets in about one year.

Brian
 
#11 ·
I think it is bunk as well Brain, I just tried using some on this car I am painting for this 16 yr old kid. Here dad was not concerned with cutting out the bad metal and replacing it. Anyways I applied the inhibitor and waited 24 hours, sanded tried to apply kitty hair and when i started sanding it was pealing off of the area. Never would stick!!!. I tried on one place inside the door jam and same thing... start sanding and it was as if the filler had never set up and peeled and crumbled off. Bad news IMO

BK
 
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