fiatben wroteOK, so I've started prepping the legs for repaint. I thought I'd try naval jelly on the rust rather than taking a wire wheel to these relatively large pieces. I'm not sure if I'm doing this right, nor am I entirely sure what I should expect to see, but ....
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the leg on the left has been "prepped" with naval jelly, the one of the right is just as it came from the bench.
What I did: I took Scotchbrite and "sanded" the entire piece, especially the heaviest rust to remove the loosest stuff. Then I applied naval jelly with a brush, worked it in a bit and then carried it to a hose in the yard to wash it all off. The instructions on the bottle do not say how long to let it sit, but do warn that the paint will come off fairly quickly (which would be OK with me). I'd estimate 5 minutes of soaking before washing off. I then did a 2nd coat on part of the inside just to see if it made any difference (none that I could tell).
However, true to the warning, it will begin to remove paint.
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Should i expect to see shiny metal where rust was, or does it somehow oxidize it to a blacker form?
Am I doing too much prep? I read somewhere that farmer hits it with a grill brush and paint. That sounds pretty good to me. This is meant to be a nice looking working machine, not a museum showpiece.
Ah yes! Another example of the mysterious running rust stains on the inside of the ss legs.
IMHO this is a candidate for 'electrolytic' rust
and paint removal!
However to answer your ????, naval jelly does not act that fast, nor IMHO as well as other methods(electrolysis, evaporust). Keep in mind naval jelly is mostly phosphoric acid(also found in certain soft drinks). As such is not friendly to flesh. I have little experience with it since I was not satisfied with results obtained. I think it does ok on light surface rust, but once the pitting starts, it is less effective(Works on thin rust, but not so well on thicker rust). I do not recall blox forming when I used it.
At this point I would knock off the top of what rust is left, and soak a part of it in evaporust at a time. It works in a much faster time frame, but ain't cheap nor too fond of being in the open air. It WILL get down into the bottom of the pitting. It WILL create a thin coating of blox.
BTW blox = iron Black Oxide.
