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Evaporust vs. Ospho

W

WESnIL

Member
A friendly neighborly discussion ended in a hung jury if you will. What is the difference in mode of action, effectiveness, etc. It seems that Ospho can be applied with a brush and one will achieve decent results while Evaporust wants a more soaking action to be effective.
 


I have used both. I found that the Evaporust is better for simple rust removal when you can immerse the rusty part. Not specifically Ospho, but the strong point of any of the phosphoric acid products is that used properly they convert the rust to iron phosphate, which is the black protective coating that is on your air impact wrench sockets.
 
Different products. I never used Ospho but it converts rust. Evapo rust is a chelating treatment that scavenges the iron from iron oxide and leaves some black residue that can be brushed off.
 
(quoted from post at 08:37:20 02/04/21)
Apples vs. oranges - different products for different uses.
Click to expand...


Wes specifically asked about the difference in mode of action which tells us that he knows that they are different, yet he know that they are both used for enhancing the appearance of rusty metal.
 
I should have added in my first post that Oshpo is probably (because I never used it) for parts that will be painted. I use Evaporust on stuff like engine parts and gears that are a little rusty.
 
I treated a furrow wheel today with Evaporust on a plow that is getting an update. That is my first time using that product. On numerous projects in the past I have used a gallon of Ospho and think I like it better but the jury is still out. The Evaporust treatment seems to leave a slightly sticky feel to the metal. Both are watery, apply easily and spread readily. Right or wrong the rest of the container will get used on the other plow parts. The CaseIH Buff Primer adheres to both equally well. At this point if I had to vote it would be for the Ospho but no good reason.
 
Aren't you supposed to scour the flaky Ospho before paint? My epoxy primered rims flaked when I pressure washed em, I used Ospho on them with no rise...
 
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