Quote:
Originally posted by jhelgesen
The metal ready leaves a zinc phosphate coating on the parts, looks like a greyish coating, after the parts are rinsed. Haven't seen any rust on the stuff I've cleaned yet.
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I saw that on the MSDS but suspect the coating is pretty thin. Given some of the harshness of the outside environments, I, for one, would add another coating of something (POR-15, cold galvanizing spray, paint etc).
Also, Metal Ready (like many rust killers - Rust mort, naval jelly, etc.) contains phosphoric acid. While it preferentially eats the rust (roughly ten times faster than the base metal), once the rust is gone, it will eat the underlying metal as well.