I have used it on some badly rusted mc parts. It works very good. I bought it at Harbor Freight and will buy it again. I do not think it is reusable as it turns black with use and did not seem to work as well once it turned black.
FWIW, I have always used Naval Jelly with good results. It's this pink gel stuff. You can find it in auto supply stores. The last time I bought some it was available in a pump spray (actually it streams) bottle in addition to the traditional brush cap bottle.
I've used Evapo-rust on tanks, tools, and various parts, and been VERY happy with it. It doesn't stink, it's safe on your hands, and won't harm paint, rubber, or the base metal. When it's used up (turns black) it's not a hazardous substance -- you can dump it down the drain or put it on your flowers if you happen to have iron-poor soil.
Naval jelly and most other rust removers are based on acids (usually phosphoric acid) -- they'll damage the metal as well as removing the rust, and they are hazardous substances.
Evapo-rust is not acid-based (dunno how it works, actually) and it's safe to leave parts in it for months -- it only eats rust, not anything else.
The only downside is cost -- at around $25/gallon, the stuff ain't cheap.
Looks like interesting stuff...what makes it work? The MSDS says that it contains no hazardous components, so there is nothing there to tell us what's in it. No health hazard except if you drink it you'll get nauseous.
I've used lots of phosphoric acid products over the years. They leave an iron phosphate (black) surface on iron & steel that is especially good to paint over. I haven't heard of it causing any damage to the steel when used according to the label instructions.
I don't really care how it works -- the stuff works as advertised, and it doesn't harm other substances. You can wander away and leave it soaking, and it won't hurt anything.
Part of following the directions with acid-based products is limiting exposure time by rinsing thoroughly and/or neutralizing, and not allowing the acid to contact other materials -- not always easy to do.
I remember one guy who was crowing about the results he got by using an acid-based rust remover on an old motorcycle. A couple of days later, he was crying about severe damage to the aluminum engine... :yikes:
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