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I've used it for some years, small parts. Been quite satisfied but for one case. This was a .45 caliber minature cannon. Originally it had a relatively shiney finish, and had rusted as a consequence of shooting it with black powder, and not cleaning it afterwards. It took off the rust, but was left with a 'gray' finish.
I used it on both of my c3 projects and the stuff worked great for me. I soaked nuts and bolts mainly for a day or two -- which cleaned them up really nicely -- then soaked / sprayed the bolts with Afterblast (phosphoric acid) which coated them nicely in a flat gray. Most guys paint after the Afterblast I'm told but I didn't want to paint bolts. They look good and clean and have held up so far.
The Evaporust worked great on brackets, too. It was a lot less effort than a wire wheel or sanding and left me pretty confident that the rust was all gone.
I use it quite a bit, really like it on fasteners (nuts/bolts/screws/etc) since they're small enough you can pour some on a smaller container, let them soak a few days, then pull them out and pour the solution back into the main container. If the parts is bigger, I'll put it in an oil pan and cover it with saran wrap. It evaporates, so needs to be stay covered.
If you don't have a couple of days to wait, you can put the container with the evaporust into another container that has hot water (don't dilute it, two separate containers). The heat speeds up the process. You can speed that up even more using hot water in an ultrasonic cleaner). I've been able to completely remove moderate rust in a couple of hours that way.
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