Re: Another Evaporust success story
Evaporust is great for entire assemblies that are badly rusted as you don't have to worry about non-ferrous parts. I've dropped in complete Strombergs to clean up screws and throttles before teardown (the crusty screws would have wiped out the threads in the zinc otherwise) and left them in the soup for weeks. The stuff will NOT eat metal after it is finished with the rust, and I'm sure you know that any other rust cleanerupper would have eaten the entire Stromberg in a day. Creative container use can help you submerge odd shaped parts without huge amount$ of ER, things like Texas's pipe or gutter up there, or cardboard boxes cut to shape needed and lined with plastic sheeting.
I don't know if Rust911 is same stuff as ER...I know there are numerous formulas, and the Home Depot equivalent is not the same.
Actual ER leaves most paints alone (except of course any that has rust underneath it), but it actually strips some tin boxes like elderly Snap-on 1/4" sets. I don't know what sorts of paint these are, but I haven't seen any removal of automotive finishes. I would except things like gauges and speedometers...faces of those can be destroyed by just water. Probably the things that give trouble were originally water based.
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